For me it is simple. If im queuing for a dungeon/trial/raid where i know every tactic "by heart" then i choose every language. Not difficult to write "hi" at the beginning and something like "bye/merci/danke..." at the end. when Im queing for something where i do think that there might be needed proper tactic communication then i choose a language that i can communicate properly. My main language doesnt exist in the game so... ;)
