WORLDGUARD-2990 - Reported by Plumeex

Hi. c:
So it's not a '''crucial''' enhancement but I like to translate everything on my server for a better experience.
Of course, we won't see this message very often (and we're only a few in the host key list), but it'd be fun to leave a kind message to a "hacker" if Minecraft has another security breach in the future.

Thanks!