Malte,
IMO, it would be a good thing. Our users have asked to receive notifications in their own language (they may not understand the sender one). I've post a suggestion about it some time ago (http://www.openacs.org/bugtracker/openacs/bug?bug_number=3041).
Notifications is part of .LRN, yes. There's no formal process yet AFAIK but we can discuss it (notifications) at next .LRN meeting.
