Mumble has a lot of awesome translators that work on translating it into many different languages.
The workflow for this centers around transifex, a online translation platform. Transifex is great at what it does but is lacking in terms of community features.
This forum is meant to be a place for current and future translators to ask coordinate and ask questions.
If your topic is language specific please prefix it with "[LANGUAGE]". Feel free to use the language for the post when talking to other translators.