I just found the mod didn't have a spanish translation, so I decided to create a .lang file by myself and upload it here.
I hope this gets into the next Galaxyspace update very soon.
Most of the texts in the file are manually translated into spanish, except for the Info-Pad texts (those are WIP anyway, won't be used properly until completed i guess) plus a little easter egg related to the Titan ores (has to do with someone we know who's frome Titan) ;)
es_ES.txt

you could fork GS repo, add that lang file to your fork, and then open pull request

Im new to GitHub. Not sure how to "fork" a repo.

there's a button for that