feat: Implement language selection feature

Assets/Translations/en.json

@@ -68,6 +68,16 @@
             "description": "Increase or decrease the size of the monospaced text."
           }
         }
+      },
+      "language": {
+        "section": {
+          "label": "Language",
+          "description": "Choose your preferred language for the application."
+        },
+        "select": {
+          "label": "Application Language",
+          "description": "Select the language used in the application's interface."
+        }
       }
     },
     "audio": {
@@ -1197,7 +1207,7 @@
       "scan-again": "Scan again"
     }
   },
-  
+
   "tooltips": {
     "refresh": "Refresh",
     "close": "Close",

Assets/settings-default.json

@@ -66,7 +66,8 @@
     "animationSpeed": 1,
     "animationDisabled": false,
     "compactLockScreen": false,
-    "lockOnSuspend": true
+    "lockOnSuspend": true,
+    "language": "en"
   },
   "location": {
     "name": "Tokyo",
@@ -255,4 +256,4 @@
   "battery": {
     "chargingMode": 0
   }
-}
+}

Commons/I18n.qml

@@ -168,6 +168,13 @@ Singleton {
       }
     }
 
+    // Check for user-defined language setting
+    if (Settings.data.general.language !== "" && availableLanguages.includes(Settings.data.general.language)) {
+      Logger.d("I18n", `User-defined language found: "${Settings.data.general.language}"`)
+      setLanguage(Settings.data.general.language)
+      return
+    }
+
     // Detect user's favorite locale - languages
     for (var i = 0; i < Qt.locale().uiLanguages.length; i++) {
       const fullUserLang = Qt.locale().uiLanguages[i]

Commons/Settings.qml

@@ -192,6 +192,7 @@ Singleton {
       property bool animationDisabled: false
       property bool compactLockScreen: false
       property bool lockOnSuspend: true
+      property string language: "en"
     }
 
     // location

Modules/Settings/Tabs/GeneralTab.qml

@@ -190,7 +190,36 @@ ColumnLayout {
     Layout.bottomMargin: Style.marginXL
   }
 
-  // Lock Screen
+  // Language selection
+  ColumnLayout {
+    spacing: Style.marginL
+    Layout.fillWidth: true
+
+    NHeader {
+      label: I18n.tr("settings.general.language.section.label")
+      description: I18n.tr("settings.general.language.section.description")
+    }
+
+    NComboBox {
+      Layout.fillWidth: true
+      label: I18n.tr("settings.general.language.select.label")
+      description: I18n.tr("settings.general.language.select.description")
+      model: I18n.availableLanguages.map(function(langCode) {
+        return { "key": langCode, "name": langCode }
+      })
+      currentKey: Settings.data.general.language !== "" ? Settings.data.general.language : I18n.langCode
+      onSelected: key => {
+        Settings.data.general.language = key
+        I18n.setLanguage(key)
+      }
+    }
+  }
+
+  NDivider {
+    Layout.fillWidth: true
+    Layout.topMargin: Style.marginXL
+    Layout.bottomMargin: Style.marginXL
+  }
   ColumnLayout {
     spacing: Style.marginL
     Layout.fillWidth: true