Languages

Common Language

[If you ever played D&D, this is the same thing]

Everyone knows common (even a little if not fluent) so intergalactic communication is easy between cultures, species, and homeworlds. This was something the High Stellar Council agreed upon early in its development and, through their programs across the stars, they ensure anyone can get a basic education.

Galactic Speech ("The Language of Old")

(editing still).