how to set language harcoded at app level

Hi all,

I would like to set language hard-coded at app level.

Such as: English language has been set in the Roku device as default language and the app gets other Spanish language from API so I want to set app's default language as getting language from back-end(API/Web-service).

Because of this, I can't update text for RAF text "Your program will begin after this message", Signin dialog box and date method. it seems that if I am able to change default language forcefully, RAF and date text will automatically change.

Is there any way to change app's default language through if device has any other language?