diff --git a/core.js b/core.js
index 98c9f3b..d81c131 100644
--- a/core.js
+++ b/core.js
@@ -3,6 +3,14 @@ var devname = "";
 var mode = 0;
 var disable_btn = false;
 
+var lang_orig_text = {};
+var lang_cur = {};
+var lang_disabled = true;
+
+var available_langs = {
+    "it_it": "it_it.json",
+};
+
 function dec2hex(i) {
    return (i+0x10000).toString(16).substr(-4).toUpperCase();
 }
@@ -29,20 +37,20 @@ async function ds4_info() {
     var hw_ver_minor= view.getUint16(0x23, true)
     var sw_ver_major= view.getUint32(0x25, true)
     var sw_ver_minor= view.getUint16(0x25+4, true)
-    var ooc = "unknown";
+    var ooc = l("unknown");
 
     try {
         const view = await device.receiveFeatureReport(0x81);
-        ooc = "original";
+        ooc = l("original");
     } catch(e) {
-        ooc = "<font color='red'><b>clone</b></font>";
+        ooc = "<font color='red'><b>" + l("clone") + "</b></font>";
         disable_btn = true;
     }
     clear_info();
-    append_info("Firmware Date: ", k1 + " " + k2);
-    append_info("HW Version:", "" + dec2hex(hw_ver_major) + ":" + dec2hex(hw_ver_minor));
-    append_info("SW Version:", dec2hex32(sw_ver_major) + ":" + dec2hex(sw_ver_minor));
-    append_info("Device Type:", ooc);
+    append_info(l("Build Date:"), k1 + " " + k2);
+    append_info(l("HW Version:"), "" + dec2hex(hw_ver_major) + ":" + dec2hex(hw_ver_minor));
+    append_info(l("SW Version:"), dec2hex32(sw_ver_major) + ":" + dec2hex(sw_ver_minor));
+    append_info(l("Device Type:"), ooc);
     return true;
 }
 
@@ -61,67 +69,70 @@ async function ds5_reset() {
 }
 
 async function ds4_calibrate_range_begin(perm_ch) {
-try {
-    if(perm_ch) {
-        await ds4_nvunlock();
-        if(await ds4_nvstatus() != 0) {
-            close_calibrate_window();
-            return show_popup("Range calibration failed: cannot unlock NV.");
+    var err = l("Range calibration failed: ");
+    try {
+        if(perm_ch) {
+            await ds4_nvunlock();
+            if(await ds4_nvstatus() != 0) {
+                close_calibrate_window();
+                return show_popup(err + l("Cannot unlock NVS"));
+            }
         }
-    }
-
-    // Begin
-    await device.sendFeatureReport(0x90, alloc_req(0x90, [1,1,2]))
-
-    // Assert
-    data = await device.receiveFeatureReport(0x91)
-    data2 = await device.receiveFeatureReport(0x92)
-    if(data.getUint32(0, false) != 0x91010201 || data2.getUint32(0, false) != 0x920102ff) {
+    
+        // Begin
+        await device.sendFeatureReport(0x90, alloc_req(0x90, [1,1,2]))
+    
+        // Assert
+        data = await device.receiveFeatureReport(0x91)
+        data2 = await device.receiveFeatureReport(0x92)
+        if(data.getUint32(0, false) != 0x91010201 || data2.getUint32(0, false) != 0x920102ff) {
+            close_calibrate_window();
+            return show_popup(err + l("Error 1"));
+        }
+    } catch(e) {
+        await new Promise(r => setTimeout(r, 500));
         close_calibrate_window();
-        return show_popup("Range calibration failed: error 1.");
+        return show_popup(err + e);
     }
-} catch(e) {
-    await new Promise(r => setTimeout(r, 500));
-    close_calibrate_window();
-    return show_popup("Calibration failed: " + e);
-}
 }
 
 async function ds4_calibrate_range_end(perm_ch) {
-try {
-    // Write
-    await device.sendFeatureReport(0x90, alloc_req(0x90, [2,1,2]))
-
-    data = await device.receiveFeatureReport(0x91)
-    data2 = await device.receiveFeatureReport(0x92)
-    if(data.getUint32(0, false) != 0x91010202 || data2.getUint32(0, false) != 0x92010201) {
-        close_calibrate_window();
-        return show_popup("Range calibration failed: error 3.");
-    }
-
-    if(perm_ch) {
-        await ds4_nvlock();
-        if(await ds4_nvstatus() != 1) {
+    var err = l("Range calibration failed: ");
+    try {
+        // Write
+        await device.sendFeatureReport(0x90, alloc_req(0x90, [2,1,2]))
+    
+        data = await device.receiveFeatureReport(0x91)
+        data2 = await device.receiveFeatureReport(0x92)
+        if(data.getUint32(0, false) != 0x91010202 || data2.getUint32(0, false) != 0x92010201) {
             close_calibrate_window();
-            return show_popup("Range calibration failed: cannot relock NV.");
+            return show_popup(err + l("Error 3"));
         }
+    
+        if(perm_ch) {
+            await ds4_nvlock();
+            if(await ds4_nvstatus() != 1) {
+                close_calibrate_window();
+                return show_popup(err + l("Cannot relock NVS"));
+            }
+        }
+    
+        close_calibrate_window();
+        show_popup(l("Range calibration completed"));
+    } catch(e) {
+        await new Promise(r => setTimeout(r, 500));
+        close_calibrate_window();
+        return show_popup(err + e);
     }
-
-    close_calibrate_window();
-    show_popup("Range calibration completed");
-} catch(e) {
-    await new Promise(r => setTimeout(r, 500));
-    close_calibrate_window();
-    return show_popup("Calibration failed: " + e);
-}
 }
 
 async function ds4_calibrate_sticks_begin(has_perm_changes) {
+    var err = l("Stick calibration failed: ");
     try {
         if(has_perm_changes) {
             await ds4_nvunlock();
             if(await ds4_nvstatus() != 0) {
-                show_popup("Calibration failed: cannot unlock NV.");
+                show_popup(err + l("Cannot unlock NVS"));
                 return false;
             }
         }
@@ -133,19 +144,20 @@ async function ds4_calibrate_sticks_begin(has_perm_changes) {
         data = await device.receiveFeatureReport(0x91)
         data2 = await device.receiveFeatureReport(0x92)
         if(data.getUint32(0, false) != 0x91010101 || data2.getUint32(0, false) != 0x920101ff) {
-            show_popup("Calibration failed: error 1.");
+            show_popup(err + l("Error 1"));
             return false;
         }
 
         return true;
     } catch(e) {
         await new Promise(r => setTimeout(r, 500));
-        show_popup("Calibration failed: " + e);
+        show_popup(err + e);
         return false;
     }
 }
 
 async function ds4_calibrate_sticks_sample() {
+    var err = l("Stick calibration failed: ");
     try {
         // Sample
         await device.sendFeatureReport(0x90, alloc_req(0x90, [3,1,1]))
@@ -157,32 +169,33 @@ async function ds4_calibrate_sticks_sample() {
             close_calibrate_window();
             d1 = dec2hex32(data.getUint32(0, false));
             d2 = dec2hex32(data2.getUint32(0, false));
-            show_popup("Calibration failed: error 2 (got " + d1 + ", " + d2 + " at i=" + i + ")");
+            show_popup(err + l("Error 2") + " (" + d1 + ", " + d2 + " at i=" + i + ")");
             return false;
         }
         return true;
     } catch(e) {
         await new Promise(r => setTimeout(r, 500));
-        show_popup("Calibration failed: " + e);
+        show_popup(err + e);
         return false;
     }
 }
 
 async function ds4_calibrate_sticks_end(has_perm_changes) {
+    var err = l("Stick calibration failed: ");
     try {
         // Write
         await device.sendFeatureReport(0x90, alloc_req(0x90, [2,1,1]))
         if(data.getUint32(0, false) != 0x91010101 || data2.getUint32(0, false) != 0x920101FF) {
             d1 = dec2hex32(data.getUint32(0, false));
             d2 = dec2hex32(data2.getUint32(0, false));
-            show_popup("Calibration failed: error 3 (got " + d1 + ", " + d2 + " at i=" + i + ")");
+            show_popup(err + l("Error 3") + " (" + d1 + ", " + d2 + " at i=" + i + ")");
             return false;
         }
 
         if(has_perm_changes) {
             await ds4_nvlock();
             if(await ds4_nvstatus() != 1) {
-                show_popup("Calibration failed: cannot relock NV.");
+                show_popup(err + l("Cannot relock NVS"));
                 return false;
             }
         }
@@ -190,65 +203,66 @@ async function ds4_calibrate_sticks_end(has_perm_changes) {
         return true;
     } catch(e) {
         await new Promise(r => setTimeout(r, 500));
-        show_popup("Calibration failed: " + e);
+        show_popup(err + e);
         return false;
     }
 }
 
 async function ds4_calibrate_sticks() {
-try {
-    set_progress(0);
-
-    // Begin
-    await device.sendFeatureReport(0x90, alloc_req(0x90, [1,1,1]))
-
-    // Assert
-    data = await device.receiveFeatureReport(0x91)
-    data2 = await device.receiveFeatureReport(0x92)
-    if(data.getUint32(0, false) != 0x91010101 || data2.getUint32(0, false) != 0x920101ff) {
-        close_calibrate_window();
-        return show_popup("Calibration failed: error 1.");
-    }
-
-    set_progress(10);
-    await new Promise(r => setTimeout(r, 100));
-
-    for(var i=0;i<3;i++) {
-        // Sample
-        await device.sendFeatureReport(0x90, alloc_req(0x90, [3,1,1]))
-
+    var err = l("Stick calibration failed: ");
+    try {
+        set_progress(0);
+    
+        // Begin
+        await device.sendFeatureReport(0x90, alloc_req(0x90, [1,1,1]))
+    
         // Assert
-        data = await device.receiveFeatureReport(0x91);
-        data2 = await device.receiveFeatureReport(0x92);
+        data = await device.receiveFeatureReport(0x91)
+        data2 = await device.receiveFeatureReport(0x92)
         if(data.getUint32(0, false) != 0x91010101 || data2.getUint32(0, false) != 0x920101ff) {
             close_calibrate_window();
+            return show_popup(err + l("Error 1"));
+        }
+    
+        set_progress(10);
+        await new Promise(r => setTimeout(r, 100));
+    
+        for(var i=0;i<3;i++) {
+            // Sample
+            await device.sendFeatureReport(0x90, alloc_req(0x90, [3,1,1]))
+    
+            // Assert
+            data = await device.receiveFeatureReport(0x91);
+            data2 = await device.receiveFeatureReport(0x92);
+            if(data.getUint32(0, false) != 0x91010101 || data2.getUint32(0, false) != 0x920101ff) {
+                close_calibrate_window();
+                d1 = dec2hex32(data.getUint32(0, false));
+                d2 = dec2hex32(data2.getUint32(0, false));
+                return show_popup(err + l("Error 2") + " (" + d1 + ", " + d2 + " at i=" + i + ")");
+            }
+    
+            await new Promise(r => setTimeout(r, 500));
+            set_progress(20 + i * 30);
+        }
+    
+        // Write
+        await device.sendFeatureReport(0x90, alloc_req(0x90, [2,1,1]))
+        if(data.getUint32(0, false) != 0x91010101 || data2.getUint32(0, false) != 0x920101FF) {
             d1 = dec2hex32(data.getUint32(0, false));
             d2 = dec2hex32(data2.getUint32(0, false));
-            return show_popup("Calibration failed: error 2 (got " + d1 + ", " + d2 + " at i=" + i + ")");
+            close_calibrate_window();
+            return show_popup(err + l("Error 3") + " (" + d1 + ", " + d2 + " at i=" + i + ")");
         }
-
+    
+        set_progress(100);
+        await new Promise(r => setTimeout(r, 500));
+        close_calibrate_window()
+        show_popup(l("Stick calibration completed"));
+    } catch(e) {
         await new Promise(r => setTimeout(r, 500));
-        set_progress(20 + i * 30);
-    }
-
-    // Write
-    await device.sendFeatureReport(0x90, alloc_req(0x90, [2,1,1]))
-    if(data.getUint32(0, false) != 0x91010101 || data2.getUint32(0, false) != 0x920101FF) {
-        d1 = dec2hex32(data.getUint32(0, false));
-        d2 = dec2hex32(data2.getUint32(0, false));
         close_calibrate_window();
-        return show_popup("Calibration failed: error 3 (got " + d1 + ", " + d2 + " at i=" + i + ")");
+        return show_popup(err + e);
     }
-
-    set_progress(100);
-    await new Promise(r => setTimeout(r, 500));
-    close_calibrate_window()
-    show_popup("Calibration completed successfully");
-} catch(e) {
-    await new Promise(r => setTimeout(r, 500));
-    close_calibrate_window();
-    return show_popup("Calibration failed: " + e);
-}
 }
 
 async function ds4_nvstatus() {
@@ -257,9 +271,9 @@ async function ds4_nvstatus() {
     // 1: temporary, 0: permanent
     ret = data.getUint8(1, false);
     if(ret == 1) {
-        $("#d-nvstatus").html("<font color='green'>locked</font>");
+        $("#d-nvstatus").html("<font color='green'>" + l("locked") + "</font>");
     } else if(ret == 0) {
-        $("#d-nvstatus").html("<font color='red'>unlocked</font>");
+        $("#d-nvstatus").html("<font color='red'>" + l("unlocked") + "</font>");
     } else {
         $("#d-nvstatus").html("<font color='purple'>unk " + ret + "</font>");
     }
@@ -267,24 +281,24 @@ async function ds4_nvstatus() {
 }
 
 async function ds5_nvstatus() {
-try {
-    await device.sendFeatureReport(0x80, alloc_req(0x80, [3,3]))
-    data = await device.receiveFeatureReport(0x81)
-    ret = data.getUint32(1, false);
-    if(ret == 0x03030201) {
-        $("#d-nvstatus").html("<font color='green'>locked</font>");
-        return 1; // temporary
-    } else if(ret == 0x03030200) {
-        $("#d-nvstatus").html("<font color='red'>unlocked</font>");
-        return 0; // permanent
-    } else {
-        $("#d-nvstatus").html("<font color='purple'>unk " + dec2hex32(ret) + "</font>");
-        return ret; // unknown
+    try {
+        await device.sendFeatureReport(0x80, alloc_req(0x80, [3,3]))
+        data = await device.receiveFeatureReport(0x81)
+        ret = data.getUint32(1, false);
+        if(ret == 0x03030201) {
+            $("#d-nvstatus").html("<font color='green'>" + l("locked") + "</font>");
+            return 1; // temporary
+        } else if(ret == 0x03030200) {
+            $("#d-nvstatus").html("<font color='red'>" + l("unlocked") + "</font>");
+            return 0; // permanent
+        } else {
+            $("#d-nvstatus").html("<font color='purple'>unk " + dec2hex32(ret) + "</font>");
+            return ret; // unknown
+        }
+    } catch(e) {
+        $("#d-nvstatus").html("<font color='red'>" + l("error") + "</font>");
+        return 2; // error
     }
-} catch(e) {
-    $("#d-nvstatus").html("<font color='red'>error</font>");
-    return 2; // error
-}
 }
 
 async function ds4_getbdaddr() {
@@ -292,20 +306,20 @@ async function ds4_getbdaddr() {
 }
 
 async function ds5_getbdaddr() {
-try {
-    await device.sendFeatureReport(0x80, alloc_req(0x80, [9,2]))
-    data = await device.receiveFeatureReport(0x81)
-    out = ""
-    for(i=0;i<6;i++) {
-        if(i >= 1) out += ":";
-        out += dec2hex8(data.getUint8(4 + i, false));
+    try {
+        await device.sendFeatureReport(0x80, alloc_req(0x80, [9,2]))
+        data = await device.receiveFeatureReport(0x81)
+        out = ""
+        for(i=0;i<6;i++) {
+            if(i >= 1) out += ":";
+            out += dec2hex8(data.getUint8(4 + i, false));
+        }
+        $("#d-bdaddr").text(out);
+        return out;
+    } catch(e) {
+        $("#d-bdaddr").html("<font color='red'>" + l("error") + "</font>");
+        return "error";
     }
-    $("#d-bdaddr").text(out);
-    return out;
-} catch(e) {
-    $("#d-bdaddr").html("<font color='red'>error</font>");
-    return "error";
-}
 }
 
 async function ds4_nvlock() {
@@ -341,27 +355,26 @@ async function ds5_info() {
 
     clear_info();
 
-    append_info("Build Time: ", build_date + " " + build_time);
-    append_info("Firmware Type:", "0x" + dec2hex(fwtype));
-    append_info("SW Series:", "0x" + dec2hex(swseries));
-    append_info("HW Info:", "0x" + dec2hex32(hwinfo));
-    append_info("FW Version:", "0x" + dec2hex32(fwversion));
-    //append_info("deviceinfo:", deviceinfo);
-    append_info("UPD Version:", "0x" + dec2hex(updversion));
-    //append_info("Unknown:", "0x" + dec2hex(unk));
-    append_info("FW Version1:", "0x" + dec2hex32(fwversion1));
-    append_info("FW Version2:", "0x" + dec2hex32(fwversion2));
-    append_info("FW Version3:", "0x" + dec2hex32(fwversion3));
+    append_info(l("Build Date:"), build_date + " " + build_time);
+    append_info(l("Firmware Type:"), "0x" + dec2hex(fwtype));
+    append_info(l("SW Series:"), "0x" + dec2hex(swseries));
+    append_info(l("HW Info:"), "0x" + dec2hex32(hwinfo));
+    append_info(l("SW Version:"), "0x" + dec2hex32(fwversion));
+    append_info(l("UPD Version:"), "0x" + dec2hex(updversion));
+    append_info(l("FW Version1:"), "0x" + dec2hex32(fwversion1));
+    append_info(l("FW Version2:"), "0x" + dec2hex32(fwversion2));
+    append_info(l("FW Version3:"), "0x" + dec2hex32(fwversion3));
     return true;
 }
 
 async function ds5_calibrate_sticks_begin(has_perm_changes) {
+    var err = l("Range calibration failed: ");
     console.log("::ds5_calibrate_sticks_begin(" + has_perm_changes + ")");
     try {
         if(has_perm_changes) {
             await ds5_nvunlock();
             if(await ds5_nvstatus() != 0) {
-                show_popup("Range calibration failed: cannot unlock NVS.");
+                show_popup(err + l("Cannot unlock NVS"));
                 return false;
             }
         }
@@ -372,18 +385,19 @@ async function ds5_calibrate_sticks_begin(has_perm_changes) {
         data = await device.receiveFeatureReport(0x83)
         if(data.getUint32(0, false) != 0x83010101) {
             d1 = dec2hex32(data.getUint32(0, false));
-            show_popup("Calibration failed: error 1 (got " + d1 + ").");
+            show_popup(err + l("Error 1") + " (" + d1 + ").");
             return false;
         }
         return true;
     } catch(e) {
         await new Promise(r => setTimeout(r, 500));
-        show_popup("Calibration failed: " + e);
+        show_popup(err + e);
         return false;
     }
 }
 
 async function ds5_calibrate_sticks_sample() {
+    var err = l("Stick calibration failed: ");
     console.log("::ds5_calibrate_sticks_sample()");
     try {
         // Sample
@@ -393,18 +407,19 @@ async function ds5_calibrate_sticks_sample() {
         data = await device.receiveFeatureReport(0x83)
         if(data.getUint32(0, false) != 0x83010101) {
             d1 = dec2hex32(data.getUint32(0, false));
-            show_popup("Calibration failed: error 2 (got " + d1 + ").");
+            show_popup(err + l("Error 2") + " (" + d1 + ").");
             return false;
         }
         return true;
     } catch(e) {
         await new Promise(r => setTimeout(r, 500));
-        show_popup("Calibration failed: " + e);
+        show_popup(err + e);
         return false;
     }
 }
 
 async function ds5_calibrate_sticks_end(has_perm_changes) {
+    var err = l("Stick calibration failed: ");
     console.log("::ds5_calibrate_sticks_end(" + has_perm_changes + ")");
     try {
         // Write
@@ -413,152 +428,155 @@ async function ds5_calibrate_sticks_end(has_perm_changes) {
         data = await device.receiveFeatureReport(0x83)
         if(data.getUint32(0, false) != 0x83010102) {
             d1 = dec2hex32(data.getUint32(0, false));
-            show_popup("Calibration failed: error 3 (got " + d1 + ").");
+            show_popup(err + l("Error 3") + " (" + d1 + ").");
             return false;
         }
 
         if(has_perm_changes) {
             await ds5_nvlock();
             if(await ds5_nvstatus() != 1) {
-                show_popup("Range calibration failed: cannot relock NVS.");
+                show_popup(err + l("Cannot relock NVS"));
                 return false;
             }
         }
         return true;
     } catch(e) {
         await new Promise(r => setTimeout(r, 500));
-        show_popup("Calibration failed: " + e);
+        show_popup(err + e);
         return false;
     }
 }
 
 async function ds5_calibrate_sticks() {
-try {
-    set_progress(0);
-
-    // Begin
-    await device.sendFeatureReport(0x82, alloc_req(0x82, [1,1,1]))
-
-    // Assert
-    data = await device.receiveFeatureReport(0x83)
-    if(data.getUint32(0, false) != 0x83010101) {
-        d1 = dec2hex32(data.getUint32(0, false));
-        close_calibrate_window();
-        return show_popup("Calibration failed: error 1 (got " + d1 + ").");
-    }
-
-    set_progress(10);
-
-    await new Promise(r => setTimeout(r, 100));
-
-    for(var i=0;i<3;i++) {
-        // Sample
-        await device.sendFeatureReport(0x82, alloc_req(0x82, [3,1,1]))
-
+    var err = l("Stick calibration failed: ");
+    try {
+        set_progress(0);
+    
+        // Begin
+        await device.sendFeatureReport(0x82, alloc_req(0x82, [1,1,1]))
+    
         // Assert
         data = await device.receiveFeatureReport(0x83)
         if(data.getUint32(0, false) != 0x83010101) {
             d1 = dec2hex32(data.getUint32(0, false));
             close_calibrate_window();
-            return show_popup("Calibration failed: error 2 (got " + d1 + ").");
+            return show_popup(err + l("Error 1") + " (" + d1 + ").");
         }
-
-        await new Promise(r => setTimeout(r, 500));
-        set_progress(20 + i * 20);
-    }
-
-    await new Promise(r => setTimeout(r, 200));
-    set_progress(80);
-
-    // Write
-    await device.sendFeatureReport(0x82, alloc_req(0x82, [2,1,1]))
-
-    data = await device.receiveFeatureReport(0x83)
-    if(data.getUint32(0, false) != 0x83010102) {
-        d1 = dec2hex32(data.getUint32(0, false));
-        close_calibrate_window();
-        return show_popup("Calibration failed: error 3 (got " + d1 + ").");
-    }
-
-    set_progress(100);
     
-    await new Promise(r => setTimeout(r, 500));
-    close_calibrate_window()
-
-    show_popup("Calibration completed successfully");
-} catch(e) {
-    await new Promise(r => setTimeout(r, 500));
-    close_calibrate_window();
-    return show_popup("Calibration failed: " + e);
-}
+        set_progress(10);
+    
+        await new Promise(r => setTimeout(r, 100));
+    
+        for(var i=0;i<3;i++) {
+            // Sample
+            await device.sendFeatureReport(0x82, alloc_req(0x82, [3,1,1]))
+    
+            // Assert
+            data = await device.receiveFeatureReport(0x83)
+            if(data.getUint32(0, false) != 0x83010101) {
+                d1 = dec2hex32(data.getUint32(0, false));
+                close_calibrate_window();
+                return show_popup(err + l("Error 2") + " (" + d1 + ").");
+            }
+    
+            await new Promise(r => setTimeout(r, 500));
+            set_progress(20 + i * 20);
+        }
+    
+        await new Promise(r => setTimeout(r, 200));
+        set_progress(80);
+    
+        // Write
+        await device.sendFeatureReport(0x82, alloc_req(0x82, [2,1,1]))
+    
+        data = await device.receiveFeatureReport(0x83)
+        if(data.getUint32(0, false) != 0x83010102) {
+            d1 = dec2hex32(data.getUint32(0, false));
+            close_calibrate_window();
+            return show_popup(err + l("Error 3") + " (" + d1 + ").");
+        }
+    
+        set_progress(100);
+        
+        await new Promise(r => setTimeout(r, 500));
+        close_calibrate_window()
+    
+        show_popup(l("Stick calibration completed"));
+    } catch(e) {
+        await new Promise(r => setTimeout(r, 500));
+        close_calibrate_window();
+        return show_popup(err + e);
+    }
 }
 
 async function ds5_calibrate_range_begin(perm_ch) {
-try {
-    if(perm_ch) {
-        await ds5_nvunlock();
-        if(await ds5_nvstatus() != 0) {
-            close_calibrate_window();
-            return show_popup("Range calibration failed: cannot unlock NVS.");
+    var err = l("Range calibration failed: ");
+    try {
+        if(perm_ch) {
+            await ds5_nvunlock();
+            if(await ds5_nvstatus() != 0) {
+                close_calibrate_window();
+                return show_popup(err + l("Cannot unlock NVS"));
+            }
         }
-    }
-
-    // Begin
-    await device.sendFeatureReport(0x82, alloc_req(0x82, [1,1,2]))
-
-    // Assert
-    data = await device.receiveFeatureReport(0x83)
-    if(data.getUint32(0, false) != 0x83010201) {
-        d1 = dec2hex32(data.getUint32(0, false));
+    
+        // Begin
+        await device.sendFeatureReport(0x82, alloc_req(0x82, [1,1,2]))
+    
+        // Assert
+        data = await device.receiveFeatureReport(0x83)
+        if(data.getUint32(0, false) != 0x83010201) {
+            d1 = dec2hex32(data.getUint32(0, false));
+            close_calibrate_window();
+            return show_popup(err + l("Error 1") + " (" + d1 + ").");
+        }
+    } catch(e) {
+        await new Promise(r => setTimeout(r, 500));
         close_calibrate_window();
-        return show_popup("Calibration failed: error 1 (got " + d1 + ").");
+        return show_popup(err + e);
     }
-} catch(e) {
-    await new Promise(r => setTimeout(r, 500));
-    close_calibrate_window();
-    return show_popup("Calibration failed: " + e);
-}
 }
 
 async function ds5_calibrate_range_end(perm_ch) {
-try {
-    // Write
-    await device.sendFeatureReport(0x82, alloc_req(0x82, [2,1,2]))
-
-    // Assert
-    data = await device.receiveFeatureReport(0x83)
-    if(data.getUint32(0, false) != 0x83010202) {
-        d1 = dec2hex32(data.getUint32(0, false));
-        close_calibrate_window();
-        return show_popup("Calibration failed: error 1 (got " + d1 + ").");
-    }
-
-    if(perm_ch) {
-        await ds5_nvlock();
-        if(await ds5_nvstatus() != 1) {
+    var err = l("Range calibration failed: ");
+    try {
+        // Write
+        await device.sendFeatureReport(0x82, alloc_req(0x82, [2,1,2]))
+    
+        // Assert
+        data = await device.receiveFeatureReport(0x83)
+        if(data.getUint32(0, false) != 0x83010202) {
+            d1 = dec2hex32(data.getUint32(0, false));
             close_calibrate_window();
-            return show_popup("Range calibration failed: cannot relock NVS.");
+            return show_popup(err + l("Error 1") + " (" + d1 + ").");
         }
+    
+        if(perm_ch) {
+            await ds5_nvlock();
+            if(await ds5_nvstatus() != 1) {
+                close_calibrate_window();
+                return show_popup(err + l("Cannot relock NVS"));
+            }
+        }
+    
+        close_calibrate_window();
+        show_popup(l("Range calibration completed"));
+    } catch(e) {
+        await new Promise(r => setTimeout(r, 500));
+        close_calibrate_window();
+        return show_popup(err + e);
     }
-
-    close_calibrate_window();
-    show_popup("Range calibration completed");
-} catch(e) {
-    await new Promise(r => setTimeout(r, 500));
-    close_calibrate_window();
-    return show_popup("Calibration failed: " + e);
-}
 }
 
 async function ds5_nvlock() {
-try {
-    await device.sendFeatureReport(0x80, alloc_req(0x80, [3,1]))
-    data = await device.receiveFeatureReport(0x83)
-} catch(e) {
-    await new Promise(r => setTimeout(r, 500));
-    close_calibrate_window();
-    return show_popup("NVSLock failed: " + e);
-}
+    try {
+        await device.sendFeatureReport(0x80, alloc_req(0x80, [3,1]))
+        data = await device.receiveFeatureReport(0x83)
+    } catch(e) {
+        await new Promise(r => setTimeout(r, 500));
+        close_calibrate_window();
+        return show_popup(l("NVS Lock failed: ") + e);
+    }
 }
 
 async function ds5_nvunlock() {
@@ -568,7 +586,7 @@ try {
 } catch(e) {
     await new Promise(r => setTimeout(r, 500));
     close_calibrate_window();
-    return show_popup("NVSUnlock failed: " + e);
+    return show_popup(l("NVS Unlock failed: ") + e);
 }
 }
 
@@ -591,7 +609,56 @@ function handleDisconnectedDevice(e) {
     disconnect();
 }
 
+function createCookie(name, value, days) {
+    var expires;
+
+    if (days) {
+        var date = new Date();
+        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
+        expires = "; expires=" + date.toGMTString();
+    } else {
+        expires = "";
+    }
+    document.cookie = encodeURIComponent(name) + "=" + encodeURIComponent(value) + expires + "; path=/";
+}
+
+function readCookie(name) {
+    var nameEQ = encodeURIComponent(name) + "=";
+    var ca = document.cookie.split(';');
+    for (var i = 0; i < ca.length; i++) {
+        var c = ca[i];
+        while (c.charAt(0) === ' ')
+            c = c.substring(1, c.length);
+        if (c.indexOf(nameEQ) === 0)
+            return decodeURIComponent(c.substring(nameEQ.length, c.length));
+    }
+    return null;
+}
+
+function eraseCookie(name) {
+    createCookie(name, "", -1);
+}
+
+function welcome_modal() {
+    var already_accepted = readCookie("welcome_accepted");
+    if(already_accepted == "1")
+        return;
+
+    curModal = new bootstrap.Modal(document.getElementById('welcomeModal'), {})
+    curModal.show();
+}
+
+function welcome_accepted() {
+    createCookie("welcome_accepted", "1");
+    $("#welcomeModal").modal("hide");
+}
+
 function gboot() {
+    window.addEventListener('DOMContentLoaded', function() {
+        lang_init();
+        welcome_modal();
+    });
+
     if (!("hid" in navigator)) {
         $("#offlinebar").hide();
         $("#onlinebar").hide();
@@ -640,7 +707,7 @@ try {
 
     if (devices.length > 1) {
         $("#btnconnect").prop("disabled", false);
-        show_popup("Please connect only one controller at time.");
+        show_popup(l("Please connect only one controller at time."));
         return;
     }
 
@@ -653,30 +720,30 @@ try {
         if(await ds4_info()) {
             connected = true
             mode = 1;
-            devname = "Sony DualShock 4 V1";
+            devname = l("Sony DualShock 4 V1");
         }
     } else if(device.productId == 0x09cc) {
         if(await ds4_info()) {
             connected = true
             mode = 1;
-            devname = "Sony DualShock 4 V2";
+            devname = l("Sony DualShock 4 V2");
         }
     } else if(device.productId == 0x0ce6) {
         if(await ds5_info()) {
             connected = true
             mode = 2;
-            devname = "Sony DualSense";
+            devname = l("Sony DualSense");
         }
     } else if(device.productId == 0x0df2) {
         if(await ds5_info()) {
             connected = true
             mode = 0;
-            devname = "Sony DualSense Edge";
+            devname = l("Sony DualSense Edge");
             disable_btn = true;
         }
     } else {
         $("#btnconnect").prop("disabled", false);
-        show_popup("Connected invalid device: " + dec2hex(device.vendorId) + ":" + dec2hex(device.productId))
+        show_popup(l("Connected invalid device: ") + dec2hex(device.vendorId) + ":" + dec2hex(device.productId))
         disconnect();
         return;
     }
@@ -687,15 +754,15 @@ try {
         $("#onlinebar").show();
         $("#mainmenu").show();
         $("#resetBtn").show();
-        $("#d-nvstatus").text = "Unknown";
-        $("#d-bdaddr").text = "Unknown";
+        $("#d-nvstatus").text = l("Unknown");
+        $("#d-bdaddr").text = l("Unknown");
     }
 
     if(disable_btn) {
         if(device.productId == 0x0df2) {
-            show_popup("Calibration of the DualSense Edge is not currently supported.");
+            show_popup(l("Calibration of the DualSense Edge is not currently supported."));
         } else {
-            show_popup("The device appears to be a DS4 clone. All functionalities are disabled.");
+            show_popup(l("The device appears to be a DS4 clone. All functionalities are disabled."));
         }
     }
 
@@ -704,7 +771,7 @@ try {
     $("#btnconnect").prop("disabled", false);
 } catch(error) {
     $("#btnconnect").prop("disabled", false);
-    show_popup("Error: " + error);
+    show_popup(l("Error: ") + error);
     return;
 }
 }
@@ -846,7 +913,7 @@ function show_popup(text) {
     new bootstrap.Modal(document.getElementById('popupModal'), {}).show()
 }
 
-function discord_popup() { show_popup("My handle on discord is: the_al"); }
+function discord_popup() { show_popup(l("My handle on discord is: the_al")); }
 
 function calib_perm_changes() { return $("#calibPermanentChanges").is(':checked') }
 
@@ -870,15 +937,19 @@ async function calib_step(i) {
     }
 
     if(i == 2) {
-        $("#calibNextText").text("Initializing...");
+        $("#calibNextText").text(l("Initializing..."));
         await new Promise(r => setTimeout(r, 100));
         ret = await multi_calib_sticks_begin(pc);
     } else if(i == 6) {
-        $("#calibNextText").text("Storing calibration...");
+        $("#calibNextText").text(l("Sampling..."));
+        await new Promise(r => setTimeout(r, 100));
+        ret = await multi_calib_sticks_sample();
+        await new Promise(r => setTimeout(r, 100));
+        $("#calibNextText").text(l("Storing calibration..."));
         await new Promise(r => setTimeout(r, 100));
         ret = await multi_calib_sticks_end(pc);
     } else if(i > 2 && i < 6){
-        $("#calibNextText").text("Sampling...");
+        $("#calibNextText").text(l("Sampling..."));
         await new Promise(r => setTimeout(r, 100));
         ret = await multi_calib_sticks_sample();
     }
@@ -902,16 +973,16 @@ async function calib_step(i) {
     $("#list-" + i + "-calib").addClass("active");
 
     if(i == 1) {
-        $("#calibTitle").text("Stick center calibration");
-        $("#calibNextText").text("Start");
+        $("#calibTitle").text(l("Stick center calibration"));
+        $("#calibNextText").text(l("Start"));
     }
     else if(i == 6) {
-        $("#calibTitle").text("Stick center calibration");
-        $("#calibNextText").text("Done");
+        $("#calibTitle").text(l("Stick center calibration"));
+        $("#calibNextText").text(l("Done"));
     }
     else {
-        $("#calibTitle").html("Calibration in progress");
-        $("#calibNextText").text("Continue");
+        $("#calibTitle").html(l("Calibration in progress"));
+        $("#calibNextText").text(l("Continue"));
     }
     if(i == 1 || i == 6)
         $("#calibCross").show();
@@ -929,7 +1000,6 @@ async function calib_open() {
 }
 
 async function calib_next() {
-    console.log(cur_calib);
     if(cur_calib == 6) {
         close_new_calib()
         return;
@@ -939,3 +1009,81 @@ async function calib_next() {
         await calib_step(cur_calib);
     }
 }
+
+function lang_init() {
+    var id_iter = 0;
+    var items = document.getElementsByClassName('ds-i18n');
+    for(i=0; i<items.length; i++) { 
+        var item = items[i];
+        if (item.id.length == 0) {
+            var new_id = "ds-g-id-" + (id_iter++);
+            item.id = new_id;
+        }
+
+        lang_orig_text[item.id] = $(item).html();
+    }
+    lang_orig_text[".title"] = document.title;
+
+    var nlang = navigator.language.replace('-', '_').toLowerCase();
+    var ljson = available_langs[nlang];
+    if(ljson !== undefined) {
+        lang_translate(ljson);
+    }
+}
+
+function lang_reset_page() {
+    var items = document.getElementsByClassName('ds-i18n');
+    for(i=0; i<items.length; i++) { 
+        var item = items[i];
+        $(item).html(lang_orig_text[item.id]);
+    }
+}
+
+function l(text) {
+    if(lang_disabled)
+        return text;
+    
+    var out = lang_cur[text];
+    if(out !== undefined) {
+        return out;
+    }
+
+    console.log("Missing translation for: '" + text + "'");
+    return text;
+}
+
+function lang_translate(target_lang) {
+    lang_cur = {}
+    $.getJSON("lang/" + target_lang, function(data) {
+        $.each( data, function( key, val ) {
+             if(lang_cur[key] !== undefined) {
+                 console.log("Warn: already exists " + key);
+             } else { 
+                 lang_cur[key] = [val];
+             }
+        });
+
+        if(Object.keys(lang_cur).length > 0) {
+            lang_disabled = false;
+        }
+
+        var items = document.getElementsByClassName('ds-i18n');
+        for(i=0; i<items.length; i++) { 
+            var item = items[i];
+            var old = lang_orig_text[item.id];
+
+            var tnew = lang_cur[old];
+            if (tnew !== undefined && tnew.length == 1 && tnew[0].length > 0) {
+                $(item).html(tnew[0]);
+            } else {
+                console.log("Cannot find mapping for " + old); 
+            }
+        }
+        var old_title = lang_orig_text[".title"];
+        document.title = lang_cur[old_title];
+        if(lang_cur[".authorMsg"] !== undefined) {
+            $("#authorMsg").html(lang_cur[".authorMsg"])
+        }
+    });
+
+}
diff --git a/index.html b/index.html
index a1ec414..31b6ade 100644
--- a/index.html
+++ b/index.html
@@ -5,12 +5,20 @@
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>DualShock Calibration GUI</title>
 
-<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
-<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6.4.2/css/fontawesome.min.css" integrity="sha384-BY+fdrpOd3gfeRvTSMT+VUZmA728cfF9Z2G42xpaRkUGu2i3DyzpTURDo5A6CaLK" crossorigin="anonymous">
+<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css"
+      rel="stylesheet" 
+      integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH"
+      crossorigin="anonymous">
+
+<link rel="stylesheet" 
+      href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6.4.2/css/fontawesome.min.css"
+      integrity="sha384-BY+fdrpOd3gfeRvTSMT+VUZmA728cfF9Z2G42xpaRkUGu2i3DyzpTURDo5A6CaLK"
+      crossorigin="anonymous">
+
+<script src="https://code.jquery.com/jquery-3.7.1.min.js"
+        integrity="sha256-/JqT3SQfawRcv/BIHPThkBvs0OEvtFFmqPF/lYI/Cxo="
+        crossorigin="anonymous"></script>
 
-<script src="https://code.jquery.com/jquery-3.7.1.slim.min.js"
-		integrity="sha256-kmHvs0B+OpCW5GVHUNjv9rOmY0IvSIRcf7zGUDTDQM8="
-		crossorigin="anonymous"></script>
 
 <script src="core.js"></script>
 </head>
@@ -34,27 +42,27 @@
 <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-YvpcrYf0tY3lHB60NNkmXc5s9fDVZLESaAA55NDzOxhy9GkcIdslK1eN7N6jIeHz" crossorigin="anonymous"></script>
 
 <div class="container p-2">
-<h1>DualShock Calibration GUI</h1>
+<h1 class="ds-i18n">DualShock Calibration GUI</h1>
 
 <div id="missinghid" style="display: none;">
-<p>Unsupported browser. Please use a web browser with WebHID support (e.g. Chrome).</p>
+<p class="ds-i18n">Unsupported browser. Please use a web browser with WebHID support (e.g. Chrome).</p>
 </div>
 
 <div id="offlinebar" class="vstack p-2" style="display: none;">
-<p>Connect a DualShock 4 or a DualSense to your computer and press Connect.</p>
-<button id="btnconnect" type="button" class="btn btn-outline-primary" onclick="connect()">Connect</button><br>
+<p class="ds-i18n">Connect a DualShock 4 or a DualSense controller to your computer and press Connect.</p>
+<button id="btnconnect" type="button" class="btn btn-outline-primary ds-i18n" onclick="connect()">Connect</button><br>
 </div>
 
 <div id="onlinebar" class="vstack p-2" style="display: none;">
-<div class="hstack gap-2"><p><b>Connected to:</b></p><p id="devname"></p></div>
-<button type="button" class="btn btn-outline-secondary" onclick="disconnect()">Disconnect</button><br>
+<div class="hstack gap-2"><p><b class="ds-i18n">Connected to:</b></p><p id="devname"></p></div>
+<button type="button" class="btn btn-outline-secondary ds-i18n" onclick="disconnect()">Disconnect</button><br>
 </div>
 
 <div id="mainmenu" class="container" style="display: none;">
 <div class="row">
     <div class="col-md-6 col-sm-12">
         <div class="card text-bg-light" >
-            <div class="card-header">Firmware Info</div>
+            <div class="card-header ds-i18n">Firmware Info</div>
 
             <div class="vstack p-2" id="fwinfo"> </div>
         </div>
@@ -63,26 +71,26 @@
 
     <div class="col-md-6 col-sm-12">
         <div class="vstack gap-2 p-2">
-            <button id="btnmcs2" type="button" class="btn btn-primary ds-btn" onclick="calib_open()">Calibrate stick center</button>
+            <button id="btnmcs2" type="button" class="btn btn-primary ds-btn ds-i18n" onclick="calib_open()">Calibrate stick center</button>
             <div class="hstack gap-2">
-                <button type="button" class="btn btn-primary ds-btn" onclick="multi_calibrate_range(true)">Calibrate stick range (permanent)</button>
-                <button type="button" class="btn btn-primary ds-btn" onclick="multi_calibrate_range(false)">Calibrate stick range (temporary)</button>
+                <button type="button" class="btn btn-primary ds-btn ds-i18n" onclick="multi_calibrate_range(true)">Calibrate stick range (permanent)</button>
+                <button type="button" class="btn btn-primary ds-btn ds-i18n" onclick="multi_calibrate_range(false)">Calibrate stick range (temporary)</button>
             </div>
-            <button type="button" class="btn btn-danger ds-btn" onclick="multi_reset()" id="resetBtn">Reset controller</button>
+            <button type="button" class="btn btn-danger ds-btn ds-i18n" onclick="multi_reset()" id="resetBtn">Reset controller</button>
         </div>
     </div>
 </div>
 
 <div class="row">
-<p> Sections below are not useful, just some debug infos or manual commands</p>
+<p class="ds-i18n">Sections below are not useful, just some debug infos or manual commands</p>
 </div>
 <div class="row">
     <div class="col-md-6 col-sm-12">
         <div class="card text-bg-light" >
             <div class="card-header">Debug info</div>
             <div class="vstack p-2">
-                <div class="hstack"><p>NVS Status</p><p class="ms-auto" id="d-nvstatus">Unknown</p></div>
-                <div class="hstack"><p>BD Addr</p><p class="ms-auto" id="d-bdaddr">Unknown</p></div>
+                <div class="hstack"><p class="ds-i18n">NVS Status</p><p class="ms-auto ds-i18n" id="d-nvstatus">Unknown</p></div>
+                <div class="hstack"><p class="ds-i18n">BD Addr</p><p class="ms-auto ds-i18n" id="d-bdaddr">Unknown</p></div>
             </div>
         </div>
         <br>
@@ -90,15 +98,15 @@
 
     <div class="col-md-6 col-sm-12">
         <div class="card text-bg-light" >
-        <div class="card-header">Debug buttons</div>
+        <div class="card-header ds-i18n">Debug buttons</div>
         <div class="vstack gap-2 p-2">
             <div class="hstack gap-2">
-                <button type="button" class="btn btn-success ds-btn" onclick="multi_nvstatus()">Query NVS status</button>
-                <button type="button" class="btn btn-primary ds-btn" onclick="multi_nvsunlock()">NVS unlock</button>
-                <button type="button" class="btn btn-primary ds-btn" onclick="multi_nvslock()">NVS lock</button>
+                <button type="button" class="btn btn-success ds-btn ds-i18n" onclick="multi_nvstatus()">Query NVS status</button>
+                <button type="button" class="btn btn-primary ds-btn ds-i18n" onclick="multi_nvsunlock()">NVS unlock</button>
+                <button type="button" class="btn btn-primary ds-btn ds-i18n" onclick="multi_nvslock()">NVS lock</button>
             </div>
-            <button type="button" class="btn btn-primary ds-btn" onclick="multi_getbdaddr()">Get BDAddr</button>
-            <button id="btnmcs" type="button" class="btn btn-primary ds-btn" onclick="multi_calibrate_sticks()">Fast calibrate stick center (OLD)</button>
+            <button type="button" class="btn btn-primary ds-btn ds-i18n" onclick="multi_getbdaddr()">Get BDAddr</button>
+            <button id="btnmcs" type="button" class="btn btn-primary ds-btn ds-i18n" onclick="multi_calibrate_sticks()">Fast calibrate stick center (OLD)</button>
         </div>
         </div>
     </div>
@@ -106,12 +114,36 @@
 
 </div>
 
+<!-- Welcome Modal -->
+<div class="modal fade" id="welcomeModal" data-bs-backdrop="static" data-bs-keyboard="false" tabindex="-1" aria-labelledby="welcomeModalLabel" aria-hidden="true">
+  <div class="modal-dialog modal-dialog-centered modal-lg">
+    <div class="modal-content">
+      <div class="modal-header">
+        <h1 class="modal-title fs-5 ds-i18n" id="welcomeModalLabel">Welcome to the Calibration GUI</h1>
+      </div>
+      <div class="modal-body">
+      <p class="ds-i18n">Just few things to know before you can start:</p>
+      <ul>
+        <li class="ds-i18n">This website is not affiliated with Sony, PlayStation &amp; co.</li>
+        <li class="ds-i18n">This service is provided without warranty. Use at your own risk.</li>
+        <li class="ds-i18n">Keep the internal battery of the controller connected and ensure it is well charged. If the battery dies during operations, the controller will be damaged and rendered unusable.</li>
+        <li class="ds-i18n">Before doing the permanent calibration, try the temporary one to ensure that everything is working well.</li>
+      </ul>
+      </div>
+      <div class="modal-footer">
+        <button type="button" class="btn btn-primary ds-i18n" onclick="welcome_accepted();">Understood</button>
+      </div>
+    </div>
+  </div>
+</div>
+
+
 <!-- New calibrate modal -->
 <div class="modal fade" id="calibCenterModal" data-bs-backdrop="static" data-bs-keyboard="false" tabindex="-1" aria-labelledby="calibTitle" aria-hidden="true">
   <div class="modal-dialog modal-lg">
     <div class="modal-content">
       <div class="modal-header">
-        <h1 class="modal-title fs-5" id="calibTitle">Stick Center calibration</h1>
+        <h1 class="modal-title fs-5 ds-i18n" id="calibTitle">Stick center calibration</h1>
         <button type="button" id="calibCross" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
       </div>
       <div class="modal-body">
@@ -119,70 +151,58 @@
         <div class="row">
             <div class="col-4">
                 <div class="list-group" id="list-tab">
-                <a class="list-group-item list-group-item-action active" id="list-1-calib">Welcome</a>
-                <a class="list-group-item list-group-item-action" id="list-2-calib">Step 1</a>
-                <a class="list-group-item list-group-item-action" id="list-3-calib">Step 2</a>
-                <a class="list-group-item list-group-item-action" id="list-4-calib">Step 3</a>
-                <a class="list-group-item list-group-item-action" id="list-5-calib">Step 4</a>
-                <a class="list-group-item list-group-item-action" id="list-6-calib">Completed</a>
+                <a class="ds-i18n list-group-item list-group-item-action active" id="list-1-calib">Welcome</a>
+                <a class="ds-i18n list-group-item list-group-item-action" id="list-2-calib">Step 1</a>
+                <a class="ds-i18n list-group-item list-group-item-action" id="list-3-calib">Step 2</a>
+                <a class="ds-i18n list-group-item list-group-item-action" id="list-4-calib">Step 3</a>
+                <a class="ds-i18n list-group-item list-group-item-action" id="list-5-calib">Step 4</a>
+                <a class="ds-i18n list-group-item list-group-item-action" id="list-6-calib">Completed</a>
                 </div>
             </div>
             <div class="col-8">
                 <div class="container" id="list-1">
-                    <h4>Welcome to the stick center-calibration wizard!</h4>
+                    <h4 class="ds-i18n">Welcome to the stick center-calibration wizard!</h4>
 
-                    <p>This tool will guide you in re-centering the analog sticks of your controller.
-                    It consists in four steps: you will be asked to move both
-                    sticks in a direction and release them.</p>
+                    <p class="ds-i18n">This tool will guide you in re-centering the analog sticks of your controller. It consists in four steps: you will be asked to move both sticks in a direction and release them.</p>
 
-                    <p>Please be aware that, <i>once the calibration is running,
-                    it cannot be canceled</i>. Do not close this page or
-                    disconnect your controller until is completed.</p>
+                    <p class="ds-i18n">Please be aware that, <i>once the calibration is running, it cannot be canceled</i>. Do not close this page or disconnect your controller until is completed.</p>
 
-                    <h5>Calibration storage</h5>
+                    <h5 class="ds-i18n">Calibration storage</h5>
 
-                    <p>By default the calibration is only saved in a volatile
-                    storage, so that if you (or this tool) mess something up, a
-                    reset of the controller is enough to make it work again. </p>
+                    <p class="ds-i18n">By default the calibration is only saved in a volatile storage, so that if you (or this tool) mess something up, a reset of the controller is enough to make it work again.</p>
 
-                    <p>If you wish to store the calibration permanently in the controller, tick the checkbox below:</p>
+                    <p class="ds-i18n">If you wish to store the calibration permanently in the controller, tick the checkbox below:</p>
 
                     <input class="form-check-input" type="checkbox" value="" id="calibPermanentChanges">
-                    <label class="form-check-label" for="calibPermanentChanges">
-                        Write changes permanently in the controller
-                    </label>
+                    <label class="form-check-label ds-i18n" for="calibPermanentChanges">Write changes permanently in the controller</label>
 
                     <br>
 
-                    <p><small>Warning: <font color="red">Do not store the calibration permanently if
-                    the controller battery is low or disconnected. It will
-                    damage your controller.</font></small></p>
+                    <p class="ds-i18n"><small>Warning: <font color="red">Do not store the calibration permanently if the controller battery is low or disconnected. It will damage your controller.</font></small></p>
 
-                    <p>Press <b>Start</b> to begin calibration.</p>
+                    <p class="ds-i18n">Press <b>Start</b> to begin calibration.</p>
 
                 </div>
                 <div class="container" style="display: none;" id="list-2">
-                    <p>Please move both sticks to the <b>top-left corner</b> and release them.</p>
-                    <p>When the sticks are back in the center, press <b>Continue</b>.</p>
+                    <p class="ds-i18n">Please move both sticks to the <b>top-left corner</b> and release them.</p>
+                    <p class="ds-i18n">When the sticks are back in the center, press <b>Continue</b>.</p>
                 </div>
                 <div class="container" style="display: none;" id="list-3">
-                    <p>Please move both sticks to the <b>top-right corner</b> and release them.</p>
-                    <p>When the sticks are back in the center, press <b>Continue</b>.</p>
+                    <p class="ds-i18n">Please move both sticks to the <b>top-right corner</b> and release them.</p>
+                    <p class="ds-i18n">When the sticks are back in the center, press <b>Continue</b>.</p>
                 </div>
                 <div class="container" style="display: none;" id="list-4">
-                    <p>Please move both sticks to the <b>bottom-left corner</b> and release them.</p>
-                    <p>When the sticks are back in the center, press <b>Continue</b>.</p>
+                    <p class="ds-i18n">Please move both sticks to the <b>bottom-left corner</b> and release them.</p>
+                    <p class="ds-i18n">When the sticks are back in the center, press <b>Continue</b>.</p>
                 </div>
                 <div class="container" style="display: none;" id="list-5">
-                    <p>Please move both sticks to the <b>bottom-right corner</b> and release them.</p>
-                    <p>When the sticks are back in the center, press <b>Continue</b>.</p>
+                    <p class="ds-i18n">Please move both sticks to the <b>bottom-right corner</b> and release them.</p>
+                    <p class="ds-i18n">When the sticks are back in the center, press <b>Continue</b>.</p>
                 </div>
                 <div class="container" style="display: none;" id="list-6">
-                    Calibration completed successfully!<br><br>
-
-                    You can check the calibration with the <a href="https://hardwaretester.com/gamepad" target="_blank">gamepad tester</a>.
-                    <br><br>
-                    Have a nice day :)
+                    <p class="ds-i18n">Calibration completed successfully!</p>
+                    <p><span class="ds-i18n">You can check the calibration with the</span> <a href="https://hardwaretester.com/gamepad" target="_blank">gamepad tester</a>.</p>
+                    <p class="ds-i18n">Have a nice day :)</p>
                 </div>
             </div>
         </div>
@@ -191,7 +211,7 @@
       <div class="modal-footer">
         <button type="button" class="btn btn-primary" id="calibNext" onclick="calib_next()">
         <span class="spinner-border spinner-border-sm" role="status" aria-hidden="true" id="btnSpinner" style="display: none;"></span>
-        <span id="calibNextText">Next</span>
+        <span id="calibNextText" class="ds-i18n">Next</span>
         </button>
       </div>
     </div>
@@ -207,8 +227,8 @@
         <h1 class="modal-title fs-5" id="staticBackdropLabel">Calibrating center</h1>
       </div>
       <div class="modal-body">
-        Recentering the controller sticks. <br>
-        Please do not close this window and do not disconnect your controller.<br>
+        <p class="ds-i18n">Recentering the controller sticks. </p>
+        <p class="ds-i18n">Please do not close this window and do not disconnect your controller. </p>
         <div class="progress" role="progressbar" aria-label="Centering" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100">
             <div class="progress-bar" style="width: 0%"></div>
         </div>
@@ -224,14 +244,14 @@
   <div class="modal-dialog">
     <div class="modal-content">
       <div class="modal-header">
-        <h1 class="modal-title fs-5" id="staticBackdropLabel">Range calibration</h1>
+        <h1 class="modal-title fs-5 ds-i18n" id="staticBackdropLabel">Range calibration</h1>
       </div>
       <div class="modal-body">
-        <b>The controller is now sampling data!</b> <br>
-        Rotate the sticks slowly to cover the whole range. Press "Done" when completed.
+        <p class="ds-i18n"><b>The controller is now sampling data!</b></p>
+        <p class="ds-i18n">Rotate the sticks slowly to cover the whole range. Press "Done" when completed.</p>
       </div>
       <div class="modal-footer">
-        <button type="button" class="btn btn-primary" onclick="multi_calibrate_range_on_close()">Done</button>
+        <button type="button" class="btn btn-primary ds-i18n" onclick="multi_calibrate_range_on_close()">Done</button>
       </div>
     </div>
   </div>
@@ -246,10 +266,10 @@
       </div>
 
       <div class="modal-body p-4" id="donateBody">
-        Hi, thank you for using this software.<br><br>
-        If you're finding it helpful and you want to support my efforts, feel free to <a href="https://paypal.me/alaincarlucci" target="_blank" class="text-body-secondary">buy me a coffee</a>! :)<br><br>
-        Do you have any suggestion or issue? Drop me a message via email or discord.<br><br>
-        Cheers!
+        <p class="ds-i18n">Hi, thank you for using this software.</p>
+        <p><span class="ds-i18n">If you're finding it helpful and you want to support my efforts, feel free to</span> <a href="https://paypal.me/alaincarlucci" target="_blank" class="text-body-secondary ds-i18n">buy me a coffee</a><span class="ds-i18n">! :)</span></p>
+        <p class="ds-i18n">Do you have any suggestion or issue? Drop me a message via email or discord.</p>
+        <p class="ds-i18n">Cheers!</p>
       </div>
       <div class="modal-footer">
         <button onclick="window.open('https://paypal.me/alaincarlucci')" type="button" class="btn btn-success" data-bs-dismiss="modal"> &nbsp;&nbsp;
@@ -275,7 +295,7 @@
 <div class="container">
   <footer>
     <div class="d-flex flex-column flex-sm-row justify-content-between py-4 my-4 border-top" id="footbody">
-      <p>Version 0.3<small class="text-muted">beta</small> (2024-04-06) - <a href="#" data-bs-toggle="modal" data-bs-target="#donateModal">Support this project</a></p>
+      <p><span class="ds-i18n">Version</span> 0.4<small class="text-muted">beta</small> (2024-04-09) - <a href="#" class="ds-i18n" data-bs-toggle="modal" data-bs-target="#donateModal">Support this project</a>&nbsp;<span id="authorMsg"></span></p>
 
       <ul class="list-unstyled d-flex">
         <li class="ms-3"><a class="link-body-emphasis" href="mailto:ds4@the.al" target="_blank"><svg class="bi" width="24" height="24"><use xlink:href="#mail"/></svg></a></li>
diff --git a/lang/it_it.json b/lang/it_it.json
new file mode 100644
index 0000000..7c01826
--- /dev/null
+++ b/lang/it_it.json
@@ -0,0 +1,119 @@
+{
+    ".authorMsg": "- Traduzione in Italiano a cura di <a href='https://blog.the.al'>the_al</a>",
+    "DualShock Calibration GUI": "GUI di Calibrazione DualShock",
+    "Unsupported browser. Please use a web browser with WebHID support (e.g. Chrome).": "Browser non supportato. Visita questo sito usando un browser con supporto WebHID (es. Google Chrome).",
+    "Connect a DualShock 4 or a DualSense controller to your computer and press Connect.": "Collega un controller DualShock 4 o DualSense al computer e premi Connetti",
+    "Connect": "Connetti",
+    "Connected to:": "Connesso a:",
+    "Disconnect": "Disconnetti",
+    "Firmware Info": "Informazioni sul Firmware",
+    "Calibrate stick center": "Ricentra gli analogici",
+    "Calibrate stick range (permanent)": "Calibra il range degli analogici (permanente)",
+    "Calibrate stick range (temporary)": "Calibra il range degli analogici (temporaneo)",
+    "Reset controller": "Resetta il controller",
+    "Sections below are not useful, just some debug infos or manual commands": "Le sezioni qua sotto non sono utili, sono per debug o comandi manuali",
+    "NVS Status": "Stato NVS",
+    "Unknown": "Sconosciuto",
+    "BD Addr": "Indirizzo BD",
+    "Debug buttons": "Pulsanti di debug",
+    "Query NVS status": "Ottieni stato NVS",
+    "NVS unlock": "Sblocca NVS",
+    "NVS lock": "Blocca NVS",
+    "Get BDAddr": "Ottieni indirizzo BD",
+    "Fast calibrate stick center (OLD)": "Ricentra velocemente gli analogici (vecchio)",
+    "Stick center calibration": "Calibrazione del centro degli analogici",
+    "Welcome": "Benvenuto",
+    "Step 1": "Step 1",
+    "Step 2": "Step 2",
+    "Step 3": "Step 3",
+    "Step 4": "Step 4",
+    "Completed": "Completato",
+    "Welcome to the stick center-calibration wizard!": "Benvenuto nel wizard di calibrazione degli analogici",
+    "This tool will guide you in re-centering the analog sticks of your controller. It consists in four steps: you will be asked to move both sticks in a direction and release them.": "Questo strumento ti guida nel ricentrare le levette analogiche del tuo controller. Consiste in quattro passi: ti verrà chiesto di spostare entrambi gli analogici in una direzione e poi rilasciarli.",
+    "Please be aware that, <i>once the calibration is running, it cannot be canceled</i>. Do not close this page or disconnect your controller until is completed.": "Attenzione: <i>se la calibrazione è in corso, non può essere annullata</i>. Non chiudere questa pagina e non disconnettere il controller finché non è completata.",
+    "Calibration storage": "Salvataggio della calibrazione",
+    "By default the calibration is only saved in a volatile storage, so that if you (or this tool) mess something up, a reset of the controller is enough to make it work again.": "Di base, la calibrazione è salvata solo in memoria temporanea, in modo che se qualcosa va storto, un reset risolve il problema.",
+    "If you wish to store the calibration permanently in the controller, tick the checkbox below:": "Se preferisci salvare la calibrazione permanentemente nel controller, spunta la casella qua sotto:",
+    "Write changes permanently in the controller": "Salva i cambiamenti permanentemente nel controller",
+    "<small>Warning: <font color=\"red\">Do not store the calibration permanently if the controller battery is low or disconnected. It will damage your controller.</font></small>": "<small>Attenzione: <font color='red'>Non salvare permanentemente la calibrazione se la batteria del controller è bassa o disconnessa. Questo potrebbe danneggiare il controller.</font></small>",
+    "Press <b>Start</b> to begin calibration.": "Premi <b>Avvia</b> per avviare la calibrazione",
+    "Please move both sticks to the <b>top-left corner</b> and release them.": "Muovi entrambi gli analogici <b>in alto a sinistra</b> e rilasciali.",
+    "When the sticks are back in the center, press <b>Continue</b>.": "Quando le levette sono nuovamente al centro, premi <b>Continua</b>",
+    "Please move both sticks to the <b>top-right corner</b> and release them.": "Muovi entrambi gli analogici <b>in alto a destra</b> e rilasciali.",
+    "Please move both sticks to the <b>bottom-left corner</b> and release them.": "Muovi entrambi gli analogici <b>in basso a sinistra</b> e rilasciali.",
+    "Please move both sticks to the <b>bottom-right corner</b> and release them.": "Muovi entrambi gli analogici <b>in basso a destra</b> e rilasciali.",
+    "Calibration completed successfully!": "Calibrazione completata con successo!",
+    "Next": "Avanti",
+    "Recentering the controller sticks. ": "Ricentro gli analogici. ",
+    "Please do not close this window and do not disconnect your controller. ": "Non chiudere questa finestra e non disconnettere il controller. ",
+    "Range calibration": "Calibrazione del range",
+    "<b>The controller is now sampling data!</b>": "<b>Il controller sta campionando i dati!</b>",
+    "Rotate the sticks slowly to cover the whole range. Press \"Done\" when completed.": "Ruota gli analogici lentamente in modo da coprire l'intero range. Premi \"Fatto\" quando hai finito.",
+    "Done": "Fatto",
+    "Hi, thank you for using this software.": "Ciao, grazie per aver usato questo software.",
+    "If you're finding it helpful and you want to support my efforts, feel free to": "Se lo hai trovato utile e vuoi supportare i miei sforzi, sentiti libero di",
+    "buy me a coffee": "offrirmi un caffè",
+    "! :)": "! :)",
+    "Do you have any suggestion or issue? Drop me a message via email or discord.": "Hai qualche suggerimento o problema? Lasciami un messaggio via email o discord.",
+    "Cheers!": "A presto!",
+    "Support this project": "Supporta il progetto",
+
+    "unknown": "sconosciuto",
+    "original": "originale", 
+    "clone": "clone", 
+    "locked": "bloccato",
+    "unlocked": "sbloccato",
+    "error": "errore",
+    "Build Date:": "Data Build:",
+    "HW Version:": "Versione HW:",
+    "SW Version:": "Versione SW:",
+    "Device Type:": "Tipo Device:",
+    "Firmware Type:": "Tipo Firmware:",
+    "SW Series:": "Serie SW:",
+    "HW Info:": "Info HW:",
+    "SW Version:": "Versione SW:",
+    "UPD Version:": "Versione UPD:",
+    "FW Version1:": "Versione FW1:",
+    "FW Version2:": "Versione FW2:",
+    "FW Version3:": "Versione FW3:",
+
+    "Range calibration completed": "Calibrazione range completata",
+    "Range calibration failed: ": "Calibrazione range fallita: ",
+    "Cannot unlock NVS": "Impossibile sbloccare NVS", 
+    "Cannot relock NVS": "Impossibile ribloccare NVS", 
+    "Error 1": "Errore 1",
+    "Error 2": "Errore 2",
+    "Error 3": "Errore 3",
+    "Stick calibration failed: ": "Calibrazione analogici fallita: ",
+    "Stick calibration completed": "Calibrazione analogici completata",
+    "NVS Lock failed: ": "Blocco NVS fallito: ",
+    "NVS Unlock failed: ": "Sblocco NVS fallito: ",
+    "Please connect only one controller at time.": "Connettere un solo controller alla volta, grazie.",
+    "Sony DualShock 4 V1": "Sony DualShock 4 V1",
+    "Sony DualShock 4 V2": "Sony DualShock 4 V2",
+    "Sony DualSense": "Sony DualSense",
+    "Sony DualSense Edge": "Sony DualSense Edge",
+    "Connected invalid device: ": "Connesso dispositivo non valido: ",
+    "Calibration of the DualSense Edge is not currently supported.": "",
+    "The device appears to be a DS4 clone. All functionalities are disabled.": "",
+    "Error: ": "Errore: ",
+    "My handle on discord is: the_al": "Il mio handle su discord è: the_al",
+    "Initializing...": "Inizializzo...",
+    "Storing calibration...": "Salvo la calibrazione...",
+    "Sampling...": "Campiono...",
+    "Calibration in progress": "Calibrazione in corso",
+    "Start": "Avvia",
+    "Done": "Fatto",
+    "Continue": "Continua",
+    "You can check the calibration with the": "Puoi controllare la calibrazione con il",
+    "Have a nice day :)": "Buona giornata! :)",
+    "Welcome to the Calibration GUI": "Benvenuto alla Calibration GUI",
+    "Just few things to know before you can start:": "Alcune cose da sapere prima di iniziare:", 
+    "This website is not affiliated with Sony, PlayStation &amp; co.": "Questo sito web non è affiliato con Sony, PlayStation &amp; co.",
+    "This service is provided without warranty. Use at your own risk.": "Questo servizio è fornito senza garanzia. Usalo a tuo rischio. ", 
+    "Keep the internal battery of the controller connected and ensure it is well charged. If the battery dies during operations, the controller will be damaged and rendered unusable.": "Tieni sempre la batteria interna del controller collegata, e assicurati che sia carica. Se il controller si spegne durante le operazioni, diventerà inutilizzabile.",
+    "Before doing the permanent calibration, try the temporary one to ensure that everything is working well.": "Non eseguire fin da subito le calibrazioni permanenti, inizia con quelle temporanee e controlla che sia tutto ok!",
+    "Understood": "Ho capito",
+    "Version": "Versione",
+    "": ""
+}