Add functionality for managing user-owned chat rooms: Implement getOwnRooms and deleteOwnRoom methods in ChatController and ChatService, add corresponding API routes in chatRouter, and enhance MultiChatDialog for displaying and deleting owned rooms with localized messages. Update i18n files for new features.

backend/routers/chatRouter.js

@@ -16,5 +16,7 @@ router.post('/oneToOne/sendMessage', authenticate, chatController.sendOneToOneMe
 router.get('/oneToOne/messageHistory', authenticate, chatController.getOneToOneMessageHistory); // Neue Route zum Abrufen der Nachrichtengeschichte
 router.get('/rooms', chatController.getRoomList);
 router.get('/room-create-options', authenticate, chatController.getRoomCreateOptions);
+router.get('/my-rooms', authenticate, chatController.getOwnRooms);
+router.delete('/my-rooms/:id', authenticate, chatController.deleteOwnRoom);
 
 export default router;