added japanese and korean localizations

packages/stream_chat_localizations/lib/src/stream_chat_localizations_ja.dart

@@ -346,4 +346,7 @@ class StreamChatLocalizationsJa extends GlobalStreamChatLocalizations {
 
   @override
   String get replyToMessageLabel => 'メッセージに返信';
+
+  @override
+  String get slowModeOnLabel => 'スローモードオン';
 }

packages/stream_chat_localizations/lib/src/stream_chat_localizations_ko.dart

@@ -344,4 +344,7 @@ class StreamChatLocalizationsKo extends GlobalStreamChatLocalizations {
 
   @override
   String get replyToMessageLabel => '메시지에 회신합니다.';
+
+  @override
+  String get slowModeOnLabel => '느린 모드 켜짐';
 }