#576 und Refactoring

lib/content_views/messages_page.dart

@@ -129,7 +129,7 @@ class _MessagesPageState extends State<MessagesPage> {
         author: message.from == _sid ? _user : _central,
         createdAt: DateTime.parse(message.time).toLocal().millisecondsSinceEpoch,
         id: message.id.toString(),
-        text: message.subj + "\n" + message.text,
+        text: "${message.subj}\n${message.text}",
       ));
 
       _messages.sort((a, b) => b.createdAt! > a.createdAt! ? 1 : 0);