I'm a USA player on a NA server, so I don't think I fully understand how things work on the EU side. I find it strange that you think a French player should speak English. If I was dealing with French players, my expectation would be that they will speak French and if I encountered them a lot, I would try to learn some French so I could talk to them. I would also try to make extensive use of the auto-translate feature.

I've met a few French players on my server and they all speak English, but I think they're probably an exception to the rule. I doubt a French player would choose to play on an NA server if they couldn't or didn't want to speak English, since most of the NA players are native English speakers.