Changing Mw2 Language

So i have found another copy of modern warfare 2 for 20 bucks but its russian. It does say that it can be modded to change the language. How exactly can i do this? i dont want to buy a russian version of cod only for it to stay hat way.

Buy a Region-Free version, Easier that way.

If you alredy bought the russian version, I will post the tutorial.

I am pretty sure you can change your language from changing a few files in your zone folder. The files in there is 3.15 gb worth of files in there, so I think you are better off buying a region-free key or W/E it is.