Changing the language in typically depends on which platform you are playing on and whether you purchased a region-locked version. While the game's interface and audio can usually be updated through platform settings, some versions—specifically those purchased in certain regions like Russia—may require more manual steps. How to Update Language to English For Steam (PC)
If you are using a version that doesn't support the Steam language toggle, you will need to manually place the English files into your directory. call of duty ghosts english language pack download upd