If the game does not automatically switch, check the Manage Game Content or Ready to Install section.
or config file in the root directory and update any "Language=" line to "english". Steam Community Method 3: Console Language Packs (PlayStation/Xbox) Call Of Duty Advanced Warfare Language Pack English BEST
Finding and installing the English language pack for Call of Duty: Advanced Warfare is a common necessity for players who purchased a regional version of the game or need to restore missing audio files. Whether you are dealing with a localized copy from Europe or Asia, switching your game to English ensures you get the original voice acting and menu clarity intended by the developers. If the game does not automatically switch, check
Call of Duty: Advanced Warfare – English Language Pack Guide (Best Working Method) Whether you are dealing with a localized copy
If you are looking for the "BEST" English Language Pack, here is everything you need to know about restoring the original audio and text.