Press the Xbox button and navigate to My games & apps .
After the download is complete, you may need to confirm the change within the game's menu:
How to Change the Language In COD Modern Warfare 2 (Fast Tutorial) Download Modern Warfare 3 English Language Pack
If you legally own MW3 on Steam, do not download random DLL files. Do this instead:
Scroll through the list of optional packs until you find (it may be split into Audio and Text packs). Click the Download arrow icon next to the English pack. Press the Xbox button and navigate to My games & apps
Xbox utilizes a unified "Manage Game" system that allows users to add or remove specific language assets to save valuable SSD space.
You don’t need a new copy. You don’t need to re-download 14GB of gut-wrenching single-player campaign. What you need is the Holy Grail of localization: Click the Download arrow icon next to the English pack
Note: Ensure your PlayStation system language is also set to English in the console settings, as the game frequently checks system defaults to determine in-game language.