added localizations

packages/stream_chat_localizations/example/lib/add_new_lang.dart

@@ -84,6 +84,10 @@ class NnStreamChatLocalizations extends GlobalStreamChatLocalizations {
     return 'Pinned by ${pinnedBy.name}';
   }
 
+  @override
+  String get sendMessagePermissionError =>
+      'You don\'t have permission to send messages';
+
   @override
   String get emptyMessagesText => 'There are no messages currently';