Oh, hello! This post is mostly aimed at people who are already in the project (Maybe I'll do a second post later).

Answering your questions: Yup, You can join the project as long as the language you want to cover is not already in use. You can tell me the language you want and I'll tell you if you can participate with that language

And no, we just need BlockTrades articles to be translated into other languages. I will make another post explaining in more detail how to join :)