When citing a foreign-language article, do I need to translate the journal name?
I'm just guessing here, but have the following suggestion. If the journal, itself, provides a translation then use that. But otherwise, use the formal name that the journal uses no matter the script or language. The name is likely trademarked and also likely known worldwide by its official name. So use that name. 

A journal regularly publishing in several languages, of course, might, theoretically at least, have official translations of its name. But otherwise, use the same form that they use.