Copied .SB files from en-GB. I've renamed them to the Spanish versions of the lesson names, but the file contents are unchanged: when you switch Scratch to Español, variable names, message names, sprite names and text strings will still be in English.
Copied 'Resources' folders from en-GB; I'm leaving the file names in English as that's how they're referred to in the Spanish lesson text, to stay consistent with the fact that Scratch's own resources files are always in English regardless of what language you set the UI to.