windowManager: Use shorter string for dialog headline

Since the headlines of the dialogs now use a much larger font, the
strings need to be shorter so they won't be ellipsized.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/942

js/ui/windowManager.js

@@ -51,7 +51,8 @@ class DisplayChangeDialog extends ModalDialog.ModalDialog {
 
         this._countDown = Meta.MonitorManager.get_display_configuration_timeout();
 
-        let title = _("Do you want to keep these display settings?");
+        // Translators: This string should be shorter than 30 characters
+        let title = _('Keep these display settings?');
         let description = this._formatCountDown();
 
         this._content = new Dialog.MessageDialogContent({ title, description });