You can install this patch on top of the English version; it will localize it.
By the way, just in case (you never know), I'll remind you that simply downloading the patch and placing it in the folder isn't enough; you need to activate it.
It's a terrible localization, and only partially complete.
Naturally, it doesn't localize all the map names, briefings, and many other things.
It results in a Frankensteinian mess.
Okay, I'll stick to playing the English version.