If an International Board is made, I do not see such a desperate need to put people in positions of "daycare supervisor" mini-mod, when really, instead, the act of reporting still exists, in game and in forum. When I see something inappropriate in a biography in game, I report it, privately and in a note to a moderator because I know they fail to check those things despite the nasty stuff people write.
If I were to step into the hypothetical International Board, and I opened a German or French thread, and I saw that spicy slang the staff could not translate, I would link and specify it to a mod. I would offer a translation as to why it is against the rules, and be on my way. I myself would not have to step in and cause a ruckus personally in that ~classique dreaded mini-mod fashion~ It would be just as reports are handled in game. Even though this may not be assuring, in a healthy group of people, everyone who has read the rules will think "yes, this is reasonable" and know what to do when the rules are observed being broken. Thus, I don't really think I'll be listing anyone to nominate for a potentially unnecessary position quite yet, though I understand your concern. Having existing mods be speakers is a plus, either way.
My final point is that, to have some faith in the kids who would post there. I'm sure a board for players primarily making threads to find their friends in game (or a tutorial on how to install Mass Markings for my poor Quebecois buddy who can't figure out why all the animals are white!) will have slow and manageable activity, and wouldn't instantly become a cesspool. Knowing there ARE existing rules, and people watching regardless of having a shiny badge that means quite nothing, it would be the calmest board on the site.
Finally, I really do like the added bonus idea of adding a language option to the text on the site itself. A drop-down option with a few common languages are enough, and that would translate the log-in page, news screen, home site, and forum. That those foreign players stuck on the game to warm up to the site itself. That would be the very icing on the cake.