Allow iPadOS/iOS app language switch at the OS level instead of app level

Use case or problem

The language currently can be changed from settings → about section in the app. This however, doesn’t notify OS about the default language, leading to consistent behavior with keyboards.
When the OS has full keyboard access enabled, it leads to inconsistent behavior with switching languages, sometimes getting stuck in one language and not switching when using external keyboard. But having the per-app language setting addresses this issue

Proposed solution

Provide the option to switch the default language for app from the App Setting’s page.

Current workaround (optional)

N/A