GB allows you to create the backoffice in another language (even with potentially different contents) to have many different ones.
However, during the login phase or with a special section, a list could be created that allows the user to choose the language and simultaneously select the relative back office.
Ex: I download the app (in the default language) I sign up and choose the language (it connects to the relevant backoffice).
I then have the possibility in my profile to choose whether or not to change the language.
Thanks so much