About rewards for translations:
Maybe we can give more power to mods? Lets choose some sort of base reward. Like 1000 words - usual bot upvote. Mod checking out translation if it's valid work he specify reward coefficient.
For example 500 words, mod specify in comment that work will be rewarded with 0.5 coefficient and bot will upvote with half of his usual power.
700 words - 0.7
1000 words - 1.0
2000 words - 2.0, etc.
Also there can be added some additional rules which can affect rewards coefficient.