Is easily said, but not as easily done. This would mean the staff would have to find people who could properly translate everything. Which would be a large task. If you mean the game itself, even harder.
Seeing as Kov has not inteded to release the game in any other languages but English, or so one would assume. But I don't know, maybe different menu options could be translated for different languages, much like other programs. Just don't see it happening ASAP.
The majority of the game's population can speak English, is why it is in English.