If you go to a school to study vocal performance, you'll probably have to take SOME sort of language classes.
No, you don't have to be fluent in any of these languages, but the more you understand the text (on your own, rather than relying on translations, which may or may not be any good), the better job you'll do of expressing what the text means.
At the VERY least, you'll need to be able to SOUND like you know the language you're singing in.
In my opinion, if you want to be successful, you'll need a basic knowledge of German, Italian, and French. (not Russian, so much). Also, Latin would be nice... And then maybe choose one of these languages to "specialize" in. If you like performing Schubert songs, then you should go deeper into German, for example...
If you're a college student now, you might consider taking German 101 (or French 101, etc..) at a local community college over the summer, just to get your feet wet.