feat: language

lib/common/constant/app_constant.dart

@@ -1,3 +1,3 @@
 class AppConstant {
-  static const String appName = "";
+  static const String appName = "Apskel Owner";
 }

lib/common/constant/local_storage_key.dart

@@ -0,0 +1,3 @@
+class LocalStorageKey {
+  static const String lang = 'lang';
+}

lib/common/extension/build_context_extension.dart

@@ -0,0 +1,5 @@
+part of 'extension.dart';
+
+extension BuildContextX on BuildContext {
+  AppLocalizations get lang => AppLocalizations.of(this)!;
+}

lib/common/extension/extension.dart

@@ -1,5 +1,9 @@
+import 'package:flutter/widgets.dart';
 import 'package:intl/intl.dart';
 
+import '../../l10n/app_localizations.dart';
+
 part 'int_extension.dart';
 part 'date_extension.dart';
 part 'string_extension.dart';
+part 'build_context_extension.dart';