Honestly this would make it so much simple for new players if we had an official statement (like a small flag when you choose your word when creating a character).

I get their current position because for instance on Zodiark we are not "branded" as French speaking yet you can find several big communities of French speaking players. So I guess it's a bit like that on each world.
But yeah, having an official indication would have made a big difference, although we can all fall back on English when needed.