I personally think the next step is just to get 1-3 multilingual moderators for each sub-forum to step forward as volunteers. These should be long-time community members.

Then, Reggie makes the subfora and makes the volunteers into moderators for their chosen fora.

If things don't work out, then, oh well.

If that's too big a commitment, then maybe we can start threads with "The <insert language> Thread" (in the appropriate language) in General. The "moderators" will post an introduction at the top of the thread, and they will bump the thread periodically to keep it "active". These threads could also be made sticky. And when the thread gets long enough, it could get its own forum.