If you are playing on PC and the above steps don't work, Verify Integrity of Game Files on Steam to ensure no files are corrupted before attempting a manual swap.
Call of Duty: Advanced Warfare Language Pack English: How to Download and Install call of duty advanced warfare language pack english
Change the very first line of text from your current language (e.g., spanish or russian ) to exactly english . Save and close the file. If you are playing on PC and the