Having a question about translating phpBB3? Want to discuss and collaborate with people currently translating phpBB3? Here would be the correct place to do so.
What should it do? After every new version of phpBB is released, most of the translators update their packages. So just subscribe to the phpBB Announcement RSS and check in a few days if the translation is available.
I probably won't implement this feature. I do not log how many times and when a translator submitted his package and this would be the only reason to do so.
Some translators however provide feeds on their sites.