Everything is translated, DLC Quest, Monster Intro Video, Quest Clear text, loading text, etc.
Note: For Citra you can choose either of the two.
Spanish Patch without Crossplay:
https://www.mediafire.com/file/su77h9oa4u7mh6l/MHXXEspanol1.4(NoCrossplay).cia/file
Spanish Patch with Crossplay...