Galactispeak is a dialect of Ancient Varadne.
There is no Modern Varadne. All life on Varadne was exterminated in a planetary civil war many centuries ago.
The species may be gone, but archaeologists and xenoanthropologists pieced together the culture as best they could.
Their language was revealed to be amazingly flexible, descriptive, and efficient.
It is also incredibly easy to learn and master in a short amount of time.
So easy, Varadne spread like a virus across the galaxy, replacing almost all other languages.
We call it Galactispeak.
And we shout it as we fight each other to the death.