nullalbe with support 70 languages

lib/country_localizations.dart

@@ -8,7 +8,7 @@ class CountryLocalizations {
 
   CountryLocalizations(this.locale);
 
-  static CountryLocalizations of(BuildContext context) {
+  static CountryLocalizations? of(BuildContext context) {
     return Localizations.of<CountryLocalizations>(
       context,
       CountryLocalizations,
@@ -18,7 +18,7 @@ class CountryLocalizations {
   static const LocalizationsDelegate<CountryLocalizations> delegate =
       _CountryLocalizationsDelegate();
 
-  Map<String, String> _localizedStrings;
+  late Map<String, String> _localizedStrings;
 
   Future<bool> load() async {
     print('locale.languageCode: ${locale.languageCode}');
@@ -33,8 +33,8 @@ class CountryLocalizations {
     return true;
   }
 
-  String translate(String key) {
-    return _localizedStrings[key];
+  String? translate(String? key) {
+    return _localizedStrings[key!];
   }
 }
 
@@ -45,14 +45,76 @@ class _CountryLocalizationsDelegate
   @override
   bool isSupported(Locale locale) {
     return [
-      'en',
-      'it',
-      'fr',
-      'es',
-      'de',
-      'pt',
-      'ko',
-      'zh',
+      "af",
+      "am",
+      "ar",
+      "az",
+      "be",
+      "bg",
+      "bn",
+      "bs",
+      "ca",
+      "cs",
+      "da",
+      "de",
+      "el",
+      "en",
+      "es",
+      "et",
+      "fa",
+      "fi",
+      "fr",
+      "gl",
+      "ha",
+      "he",
+      "hi",
+      "hr",
+      "hu",
+      "hy",
+      "id",
+      "is",
+      "it",
+      "ja",
+      "ka",
+      "kk",
+      "km",
+      "ko",
+      "ku",
+      "ky",
+      "lt",
+      "lv",
+      "mk",
+      "ml",
+      "mn",
+      "ms",
+      "nb",
+      "nl",
+      "nn",
+      "no",
+      "pl",
+      "ps",
+      "pt",
+      "ro",
+      "ru",
+      "sd",
+      "sk",
+      "sl",
+      "so",
+      "sq",
+      "sr",
+      "sv",
+      "ta",
+      "tg",
+      "th",
+      "tk",
+      "tr",
+      "tt",
+      "uk",
+      "ug",
+      "ur",
+      "uz",
+      "vi",
+      "zh",
     ].contains(locale.languageCode);
   }