You don’t need an additional widget to translate the app to a different language. In the Desktop Modeler (Mendix Studio Pro), Language is one of the default items in the topbar menu. And you can add different languages from there.
I advise you to look at the following module of one of the intermediate-level learning paths. It is explained in detail there:
You can also look at this link: https://docs.mendix.com/howto/collaboration-requirements-management/translate-your-app-content
Good luck and kind regards,