Remove bits of the Spanish translation

[peterjc]

I am assuming these are left overs from setting up the Japanese repository based on the Spanish translations, and can be removed.

[dpshelio]

If this is to merge with upstream - at the moment scarpentry-i18n/i18n, but under carpentries in the future - we shouldn't remove the Spanish files. The idea is that this repository works as a hub for all the (see carpentries/lesson-infrastructure#24)

[peterjc]

That makes more sense now, thanks - presumably I missed something documenting this. Shall I close this?

[TomKellyGenetics]

There are some remnants from the Spanish lessons in the Japanese.

There is a related issue to ensure that the PO files only generate English-Japanese and not Spanish-Japanese (or all languages already in the repo)
carpentries-i18n#6