I have never been matched with a non-English group. Maybe it's your server or DF settings.
If you put F-G-J you could potentially be matched with them.

That said, there's no reason for the group to slow down for YOU.
3/4 of the people in the dungeon are there for their roulettes. If you want to experience, do it yourself afterwards.
I've gone in unsynced with my chocobo to clear dungeons I wanted to experience more of and read the signs after I've cleared the content.
Some of the mechanics can be tricky, but it's not impossible for most up to and including some level 50 content.