I live in Luxembourg in which the default language is either Luxembourgish or French. My English language apps come up in English and my local apps in French. I don't know why a mobile phone would seek to translate stuff that you have chosen to see in a different language - it makes no sense whatever!
For the last 10 years of my career, I worked at the Translation Centre for the Bodies of the European Union (bit of a mouthful, eh) and whilst there I met an American who asked why the EU still have translators when Google Translate can do it automatically. I tried to explain to him the world wars would be starting if the EU relied on Google for its translations but I could not convince him that Google Translate was absolute dog-wank compared to the output of a highly trained professional translator!