Recently the Greek board experienced a sort of spam tornado in this thread, which intrudes the forum rules[1], and I don't believe there's any staff member who would notice my report (there aren't lots who speak Greek to begin with, let alone to moderate the board).
Mods don't have to speak your language in order to moderate your board and remove spam. It won't be perfect of course and it would be much better if you have their own board, but if you report those posts, mods will most likely remove it. For example, Croatian local board doesn't have own moderators for the last few years ever since Lauda was removed so now we depend on the global mod sorting our reports. Just today I reported spam topic and it was deleted in a matter of few hours.
Anyway, good luck with your request and I do hope that you get local mod appointed. We asked for the same few years ago but so far we didn't get any reply yet, maybe because our local board is pretty clean and doesn't have too much spam. I personally think that every local board should have their own mod and that role could be much more than just being a police but I guess those in charge don't agree.