Reverts of [[User:Cin|cin]]

Done. There is quite a big amount of wrong translated messages by Cin, so I had to review every single one of them. I guess he is not used with our specific glossary of terms. This is one of the main problems faced my translatewiki, unexperienced users. Too bad.

Yep, it happens. Usually it helps if there is a small number of very active translators for a language, so that issues with new translators are noticed early. In that case the new translators either learn, or should be advised to go and translate elsewhere (if they don't learn after a few attempts).