The user must have the rep above 50 in order to contribute through Utopian.

Reputation does not guarantee someone is really capable and qualified (ie: transaltion), sometimes newcomers on this platfrom have abilities above average, they are just new to steemit and utopian.

Keep the minimum words to 500. It takes solid amount of time already.

I agree with this point. Translating 500 words is really time consuming except using google translate.

The last thing that I 100% agree with is this point;

If the introduction given in the translation post contains a lot of grammatical errors, it should be rejected. Because if the person can't speak English well, then how he can you expect good translation from him?