Hello friend, I don't have a redmi4 but if you still have problem(s) with your phone language, hope this will help:
You must unlock your redmi4 and a recovery to install a new rom that supports your language you want (such as eu rom, from here https://xiaomi.eu/community/threads/7-5-25.40192/ ).
You must unlock your redmi4 and a recovery to install a new rom that supports your language you want (such as eu rom, from here https://xiaomi.eu/community/threads/7-5-25.40192/ ).