polyglot list serves

On the Agile Tour organizer's list this year we adopted a list serve culture I haven't seen elsewhere--members are invited to type in their native tongue, and liaisons (like me) translate the text to English. Everyone has decent reading comprehension of English, but may find it hard to write in it. This makes participation in the list easier for almost everyone... Have you participated in a list like this? What kinds of language- or process-related problems have you encountered?