I don't have a firsthand experience with the Croatian board, maybe there is a global moderator who knows Croatian, or maybe it's sufficient for a global moderator to translate using a machine translator for the Croatian board.
Afaik no global mods speaks Croatian and they probably rely on Google translate to moderate ours. Its pretty much the same thing for "Other languages/locations" as all of them, are moderated by Cyrus and i doubt he speaks all those languages there.
I'm not 100% sure, I just make my observations, one of which is: if you've found a somewhat established, trustworthy, active forum user who's been accurate on reporting posts elsewhere and who natively speaks the local board's language, then it's more appropriate to have him moderate the board than a global moderator who's more prone to failure.
I 100% agree with you that it would make more sense to have a native speaker moderating local board than relying on Google translate, but unfortunately we weren't lucky in our request, even though at the time we asked for one we were among the most active local boards and we never got a reply. I wish you luck though and hopefully you get some answer.
Try translating the posts from the thread I linked, and tell me if you can verify that it's off-topic, zero value, trolling and spamming. I'll wait
Have you reported those spam posts? Imho its worth a try.