I've been doing it since launch. Makes DPS queue times way less painful.I've had parties with people from other languages maybe twice in all that time. May have been more but oftentimes my roulettes go like this or are in complete silence so language is irrelevant:

Tank: Hello!
Healer: Hihi.
DPS 1 & 2: Hi/Hullo
Silence
Clear Dungeon
Everyone: Thanks, bye!

It's not like you need to coordinate to do dungeons anymore except on patch launch day. Most people know what to do. If I'm going into more difficult content it's with PF/FC party so langugage is a non issue. As long as you use the auto-translate function if needed, it's fine.