I realize the game itself recommends allow every race to understand one another for convenience, However, In my own games I prefer to make a purpose for Protocol droids and Translators.
I am wondering, though I doubt it, If there is a universal Translator device/piece of gear in any of the books. (beyond a protocol droid)
I plan to make one available, if not in any books... still working out what it's price will be.
What I do in my game (just FYI) is everyone gets there native Language and 2 additional languages...Basic Being the Standard Human Language. This makes it Easy for all Players to choose to understand basic, even if some races might find themselves at a disadvantage of not being able to properly speak it.