Galach - the universal language used in DUNE's universe. Pictured, the descriptions of stillsuit's parts with English translations.

There are some examples of Galach, hints about how it should work, what languages it had evolved from and so on and so forth, but it wasn't officially codified into a language you could learn and use.

I didn't watch the movie, I'm waiting for the second part to arrive, but I know, that a linguist, David Peterson was hired to develop at least semi-coherent languages and taught actors to use them.