updating youText in ja + ko based on Eric's input

packages/stream_chat_localizations/lib/src/stream_chat_localizations_ja.dart

@@ -331,7 +331,7 @@ class StreamChatLocalizationsJa extends GlobalStreamChatLocalizations {
   String get inText => 'に';
 
   @override
-  String get youText => 'お客様';
+  String get youText => 'あなた';
   // This is the word for 'customer' or 'user' because saying 'you' directly is too informal and rude
 
   @override

packages/stream_chat_localizations/lib/src/stream_chat_localizations_ko.dart

@@ -335,7 +335,7 @@ class StreamChatLocalizationsKo extends GlobalStreamChatLocalizations {
   String get inText => '에';
 
   @override
-  String get youText => '고객님';
+  String get youText => '당신';
   // This is the word for 'customer' or 'user' because saying 'you' directly is too informal and rude
 
   @override