No.. it is no reason for ban... as long as you put adsense on language which google supports... You can see the language supported by google on the adsense faq Ani
i chek the FAQs of google adsenes a few days ago and i think you dont worry about that. )unless you type in Latim)
It is not a matter to worry much as google supports many languages. Using multilanguage is not a problem and if you wish, you can check the languages supported by google. Carry on dude.