Xbox handles language packs through system localization settings or the add-on management menu.
Have you successfully switched your language? Did you run into a weird "Sound crackling" issue after swapping? Let me know in the comments below!
localization.txt (The root text file that tells the game engine to read the English folder) Step-by-Step Manual Fix
Disclaimer: Some foreign retail versions (particularly Russian) are strictly locked to their native language and may not accept English files without a full crack or modified patch. Depot 310343 - Advanced Warfare (Call of Duty - SteamDB