My thoughts on the matter, having read and considered the existing discussion but not replying to any particular part of it:
Enlisting a new mod for every language spoken here doesn't make sense. A monolingual server with five mods and a thousand users is very different from a server with five languages, each with two hundred users and one mod - each language may have a different rate of abuse, mods can't pick up one another's slack when they go on vacation, etc. Moreover, evaluating a foreign-language candidate's suitability is unlikely to be better than guesswork, and rogue mods can cause a lot of damage very quickly. I do not think you will find this an effective solution.
You might reason something like the following:
1. In order that other servers need not block us to avoid being spammed, and to improve the experience of our own users, all content posted here is moderated.
2. As discussed above, content in languages other than English cannot be practicably moderated here.
3. Therefore, the set of content posted here (which, by statement 1, *is* guaranteed moderated) must be disjoint from the set of content in languages other than English (which, by statement 2, *cannot be* guaranteed moderated).
Ergo, content posted here must be in English.
If you think that user-submitted translations on the honour system are suffucient to make content locally moderatable, you can amend statements 2 and 3 accordingly - but I tend to think that you shouldn't consider such posts actively moderated, because you rely on user reports to find out that someone's cheating.
The appropriate solution is *not* for QOTO to try to bodge together a Swiss-army-knife mod team that can moderate any content, but for users who post content that QOTO cannot moderate to use another server that can (or recruit their own moderators and start their own). Then we federate with them and everyone is happy.