Most JP understand 'Ifrit/Garuda/Moogle", so it's really not a problem as well as 'BLM/PLD/WHM' etc, so there's actually no hindrance with/without the auto-translate since it's already more of a hassle to use to begin with in Japanese.

I've read nor seen nothing about this being mentioned by them but you also have to take into consideration even on large servers a lot of players will remember certain people and how they play/compose themselves so even with limited understanding of English, Japanese players may remember someone and how they were in a party or something and simply just not invite them.