The Android OS should upgrade to its latest 12 version in just a few months. There are some preview builds around, the latest of which is now reported to have a new and powerful feature. It is a service that translates app contents to a phone's system language. Some pre-existing third-party apps are capable of this, although it seems Google may want to bake it into their new UI.
https://www.notebookcheck.net/Android-12-might-be-able-to-auto-translate-a-user-s-apps-to-their-chosen-language.533141.0.html