Open your and right-click on Call of Duty: Modern Warfare III (or the 2011 version). Select Properties > Language . Select English from the dropdown menu.
Press the on your controller and select Manage Game Content . Scroll to Language Data . Locate the English pack and select the Download icon . Download Modern Warfare 3 English Language Pack
Check for any available in the "Ready to Install" or "Add-ons" section. Manual Fix for the 2011 Version (Advanced) Open your and right-click on Call of Duty: