For several months we have been trying to increase the translations and revisions in transifex, I believe that a good way to motivate is to make a recognition (diploma) to the volunteers, with this diploma people can add it to their linkedin or even to their curriculum.
I also want to propose adding a badge here in talk of people who have accounts in transifex and somehow have done a translation or revision (this could be with the user put his id on talk)
What do you think?
FYI @darius