I want to ask about rules - Tags that are sets names. They may be in japanese or should be translated\romaized?

I have lot of setst but names, are mostly in Japanese. What to do? Leave Japanese name when uploading or romanize them?

I'd say romanize them.

http://nihongo.j-talk.com/kanji/

I use this to romanize them then run it by a native speaker to ensure it was actually correct. Barring that you can leave a comment or we could use this thread for romanization help.