I too am very interested in the language capabilities of PHPBB.
I have dived in head first and am now committed to this software through the good times and the bad.
As mentioned earlier in this thread, the language section is reliant on volunteers. I will be trying my best to provide Japanese and Hungarian translations for the 3.1.x build.
As priorities are being discussed in this thread, and as a new user of PHPBB, I hope you would find interest in me sharing my feeling on the current situation.
A core dev team is pushing along the core product of PHPBB and doing this well. Around the core product all the real benefits such as extensions and language packs are getting left far behind. Volunteers can't keep up with the pace of the core dev team. This I believe is a problem with this model. It was hard enough as a new user to get my head around what I can match with what. But now I have grasped all the concepts I worry that key benefits that sell the platform to new users could, in neglect, cause the core product to suffer.
Would it even be feasible if the core dev team slowed down the core product and focused on providing some exciting and useful extensions for the 3.1.x platform? Also - still no 3.1.x documentation. Is that on a road map or also requires a volunteer?