You can checkout the locale switcher in the appstore.
This allows you to change the language/timezone for a specific user and some other features.
After reading the description, Im not sure, if locale switcher is the one you are looking for.
Read:
https://docs.mendix.com/refguide/translatable-texts#4-setting-the-end-user-s-language
https://docs.mendix.com/howto/collaboration-requirements-management/translate-your-app-content
https://medium.com/mendix/mendix-optimize-runtime-translations-ae6c7ec35dee