You'll have to edit the loc database of the language you're playing. So if you're playing in English, you'll have to edit the eng_us.db. Extract them by using CG File Explorer and then edit them via DB Master, then regenerate. If you don't see any changes in your game, you have to move your locale.big to data/loc in the FIFA 15 directory (move the existing one from 15 somehwere else), open your FIFA 15 DB via CM15, then close it again and move the locale.big back into the FIFA 16 directory. Otherwise the game won't read the edited file. You have to do the moving stuff because CM15 can't open the FIFA 16 database, so you'll have to use FIFA 15's as a substitute.