When a user's phone is set to a language not supported by Phorest Go, then it will display in English, but this can cause some problems. Examples we have come across:
Estonians/Thai/Russians/Swedes who have better Finnish than English, see Phorest Go in English, but would prefer it to be in Finnish.
Probably similar stories for foreign staff in salons in DACH.
Letting the user choose what language they want New Go to be in would be a nice touch.