I think maybe it has somthing to do with the fact that English is always a GMs second language if they are on an EU realm as the GMs are all in france, makes them so polite. did say maybe
I can absolutely confirm that English isn't a second language to *all* GMs

I personally (not via my next door neighbour's friend's cat's aunt who once overheard somebody talking on the phone to a distant relative, but personally) know an English guy who worked as a GM in France.

The salary (<20k euros/year to start, as I recall) just doesn't make it worthwhile in my humble opinion, but they do indeed recruit across Europe.

My understanding is that they actually work mostly out-of-game with a dedicated support client, rather than actually "in" WoW, and it does indeed support canned responses of the type I'm sure we've all seen, but that's by the by....