In some ways I would say a translated version would be a disservice to those willing to learn - take it as you will English is THE language for computing and, actually, for programming languages - "if" "then" "for" "while" - nearly all commands in a programming language are plain English words. So a certain understanding of programming concepts goes hand in hand with understanding a level of English. And while there may be less "programming" with C2, there's no less programming logic (as per the anecdote: "A wife sends her programmer husband to the store and says: Buy a loaf of bread, if they got eggs take a dozen" so he comes home with a dozen loaves of bread and says: 'They had eggs'"). Most of the tutorial content is in English, all the most valuable threads here are in English and, let's be honest - probably most of the paying customers understand English quite well enough.
however, there are a lot of things that could be painlessly translated (like the descriptions that c2 gives of some conditions and actions, of proprieties, etc), most people would rather read those in their language, as they are not as easy to understand as some wording that may be tossed into a language.
a way to implement it in the next editor will be nice, as C2 is not only used by people knowing a lot of english, and some are just using it as an introduction to logic, and logic is not tied to a language, and I say it because adding it in midway would be far too much work.