Hi Yaron,
Thanks for continuing to push this forward. I have been a bit swamped recently. The thing is that there are several projects who are all JUST on the edge of being able to do what we need but none that are there yet.
I got an e-mail from a pootle developer saying that they are doing work to do just this sort of thing for the Mozilla project however it is not ready yet, the wikimedia foundation is in the same boat.
I do not know if Weblate will work or not.
Basically we have 3 big requirements that have been sticking points for various solutions.
1) Real Names and e-mails for all contributors
2) Individual attribution for all translations. So we know exactly who changed what string.
3) Generate incremental diffs/patches/change sets divided based on translator.
Generally it is #2 that has been the hardest for projects to cope with.
-aric