Why is it not translated?
I'm pretty sure it's because It's a new feature. IANJ, but I'm assuming he will not implement a translation for that until the feature works as he intends.
yep
It's because the translators haven't translated it yet. When they can get around to it, this'll be fixed.
Expanding on that a little: Jens is amazing, but he doesn't speak every language. We rely on users who are native speakers to translate. So the German translation is always up to date, and the Catalan translation happens very promptly. Then the others trickle in. Right now we're on version 10.3.2, and the ".2" is mainly because of translations happening.
I made a translation correction for Russian but I apologize it broke! 
I also noticed Spanish wasn't translated correctly either so I made that quickly:
If you know the languages, and aren't using google translate, you may be able to try and submit a pull request to update the translations.
yes, but please please only submit translation updates if 1) you really know and speak the language fluently if not natively and b) have checked the existing translation and possibly also sent an email to the original translator(s) and c) actually know not just the language but also the Snap! feature you offer a translation for. Nothing is worse than some overly eager Google translate users breaking a "real" translation from a native speaker. We've had some of that happen with the Spanish translation at one point and it really messed up schools in Latin America. Thanks!