Looks like https://twitter.com/vanno_kamoyo figured out how the Jyuman language works.
Apparently the cockpit buttons are just U, L, D, R
And some of the signs in episode one are OASIS, GRAPE, BEAN, SOY
Vanno Kamoyo's blog explaining the deciphering process:
Made a wiki article about that in case people translate other words in other episodes.
It looks like they don't know what J, Q, or Z is yet. And they have a Square shape but they don't know which English letter it's associated with.