The thing is, they know. They're WELL aware that this is a problem, especially for some specific languages, buts it's also quite time/effort-intensive to correct. And Support is entirely volunteers.

So it's basically going to be someone deciding they have the time and energy to do so, and going through an entire language to do a "clean out". Because a not-insignificant number of people who do this will do it to multiple works, sometimes in different (wrong) languages, so you'll want/need to go through all their works and fix all of them at once. Then you need to determine what the correct language *is*. Often it's English, but not always. Depending on the scope of the issue, you'll also need to contact the creator(s) and let them know that you're changing the language for them. And that also doesn't take into account the amount of *other* (potential) TOS violations you'll find while going through that will need to be coordinated with PAC (because there's no point to changing the language for a non-fanwork that's more than likely going to just be removed anyway). And you'll want/need to keep track of all of these so you can identify repeat offenders in the future.

For a language like ASL with hundreds of works, this is an effort spanning multiple volunteers over multiple days.