message: Define a title for generic error
diff: @@ -1098,7 +1098,7 @@ export default React.createClass({
  modal.close();
  console.error("Failed to leave room " + roomId + " " + err);
  Modal.createTrackedDialog('Failed to leave room', '', ErrorDialog, {
  - title: title,
  + title: _t("Failed to leave room"),
  description: _t("Unknown error"),
  });
  });
  