feat: support for japanese

packages/stream_chat_localizations/lib/src/stream_chat_localizations.dart

@@ -11,6 +11,8 @@ part 'stream_chat_localizations_fr.dart';
 
 part 'stream_chat_localizations_it.dart';
 
+part 'stream_chat_localizations_ja.dart';
+
 part 'stream_chat_localizations_hi.dart';
 
 /// The set of supported languages, as language code strings.
@@ -27,6 +29,7 @@ const kStreamChatSupportedLanguages = {
   'fr',
   'it',
   'es',
+  'ja',
 };
 
 /// Creates a [GlobalStreamChatLocalizations] instance for the given `locale`.
@@ -59,6 +62,8 @@ GlobalStreamChatLocalizations? getStreamChatTranslation(Locale locale) {
       return const StreamChatLocalizationsIt();
     case 'es':
       return const StreamChatLocalizationsEs();
+    case 'ja':
+      return const StreamChatLocalizationsJa();
   }
 }