Flathub: Add Spanish translation

[manuq]

Metainfo is in https://github.com/endlessm/endless-key-flatpak/tree/f2eae745ca088e4b4abf88e94ae1bc3ae8fdd12d/data/metainfo

Translated screeshots here: https://www.dropbox.com/scl/fo/nxqdtyyvpkatbl0gcgqcq/h?rlkey=l524pdllrbxkkomm89qmw2ujf&dl=0

Translated copy here: https://docs.google.com/spreadsheets/d/1yVTilb6AWsyUGVncyoYSjtbOdPAEZA_BarnnTfUDxfg/edit#gid=1177927074

[cassidyjames]

The metainfo should be translated in the same way as the UI copy since it's in-repo, but I'm not sure how the translations are set up.

[dylanmccall]

Yep, translations for the metainfo file should just work, although we only just updated the pot file over here: 8db0bfb. It kind of fell by the wayside earlier. (Could do with some automation: #116). To update pot files, you need to have a terminal open inside the build directory generated by meson, for example using New Build Terminal in GNOME Builder, and then run this command:

ninja kolibri-gnome-pot

… and this command to merge that change with all the PO files (although that might not be necessary depending on how we talk to Transifex?):

ninja kolibri-gnome-update-po