Thanks! Can you link to the page where I can blacklist a locale for a specific project? I help manage iNaturalist.
Regarding approval, the problem is that we have country-specific portals into our platform with groups that manage them, and sometimes those groups want approval control over translations to ensure their users see consistent use of language on their portals, and they get frustrated when they translate a string one way and some other translatewiki user comes along and changes it. They don't want to have to engage in the kind of constant negotiation process you're suggesting, they just want to translate it once and lock it down. For example, I think our Mexican partners have had to re-translate switches from "Tú" to "Usted" numerous times and they're tired of it. From what you're saying, it sounds like locking things down is impossible on translatewiki, which is fine, but I just wanted to describe the problem such a feature would solve. Whether or not it is a problem is pretty subjective, but from the perspective of these particular people, it is a problem.