Instructions
Xbox 360
Go to the "My Xbox" menu and select "System Settings."
Choose "Console Settings" and select "Language and Locale."
Select "Language" and then choose the desired language. The OpFor language in "Call of Duty 4: Modern Warfare" will now be changed, along with your Xbox 360 menus.
PS3
Go to the "Settings" menu and select "System Settings."
Choose "System Language."
Select the desired language. The OpFor language in "Call of Duty 4: Modern Warfare" will now be changed, along with your PS3 menus.