As much as I understand, the problem with translations is that it is end-to-end work. Perhaps this should change to contributable, decentralized framework, where each person can contribute at parts of the translation before it gets completed.
A good example is the WordPress translation framework for its plugins and themes.
I'd like to contribute, as I have already done for many WP plugins, but I never completed a translation from 0 to 100% because there are some aspects that other people are more suitable in editing that parts than me.