feat: add localisation

lib/utils/app_updater.dart

@@ -5,6 +5,7 @@ import 'package:go_router/go_router.dart';
 import 'package:kooltab2/utils/app_update_util.dart';
 
 import 'app_config.dart';
+import '../l10n/app_localizations.dart';
 
 class UpdateChecker {
   static bool _hasChecked = false;
@@ -39,16 +40,18 @@ class UpdateChecker {
   }
 
   static void _showUpdateDialog(BuildContext context, UpdateInfo update) {
+    final l10n = AppLocalizations.of(context);
+
     showDialog(
       context: context,
       barrierDismissible: !update.mandatory,
       builder: (dialogContext) => AlertDialog(
-        title: const Text("Update available"),
+        title: Text(l10n.updateAvailable),
         content: Column(
           mainAxisSize: MainAxisSize.min,
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            Text("Version ${update.version} is available."),
+            Text(l10n.versionAvailable(update.version)),
             const SizedBox(height: 12),
             Text(update.notes),
           ],
@@ -57,14 +60,14 @@ class UpdateChecker {
           if (!update.mandatory)
             TextButton(
               onPressed: () => Navigator.pop(dialogContext),
-              child: const Text("Later"),
+              child: Text(l10n.later),
             ),
           FilledButton(
             onPressed: () {
               Navigator.pop(dialogContext);
               context.push('/update-progress', extra: update);
             },
-            child: const Text("Update"),
+            child: Text(l10n.update),
           ),
         ],
       ),