As I've stated before, I'm afraid we don't currently offer rewards for continued maintenance. I am also not even sure how we could design such a system that would not be abused. If we offered rewards for changing existing translations, for example, it would incentivize people to just make lots of pointless changes and claim rewards. We already have had to deal with worse kinds of abuse in the translation system.
Again repeating what I've said before, I simply cannot be involved in discussions about translation quality, especially as I don't speak a word of the language. However I will emphasize that good quality translations must be done in collaboration with the community. A good translator will listen to feedback and make any necessary changes. If a translator insists on their own translations against the wishes of the wider community, not only does that result in poor quality work, it could be considered abuse and result in a ban.