changed naming for participants

lib/view/pages/talk/chatDetails/chatInfo.dart

@@ -66,7 +66,7 @@ class _ChatInfoState extends State<ChatInfo> {
             if(participants != null) ...[
               ListTile(
                 leading: const Icon(Icons.supervised_user_circle),
-                title: Text('${participants!.data.length} Teilnehmer'),
+                title: Text('${participants!.data.length} Mitglieder'),
                 trailing: const Icon(Icons.arrow_right),
                 onTap: () => TalkNavigator.pushSplitView(context, ParticipantsListView(participants!)),
               ),

lib/view/pages/talk/chatDetails/participants/participantsListView.dart

@@ -19,7 +19,7 @@ class ParticipantsListView extends StatelessWidget {
 
     return Scaffold(
       appBar: AppBar(
-        title: const Text('Teilnehmende'),
+        title: const Text('Mitglieder'),
       ),
       body: ListView(
         children: [