[Tails-l10n] [merge] spanish translation - about

I hereby request to merge the reviewed about.es.po:

http://git.tails.boum.org/emmapeel/tails/commit/?h=po/es&id=290ed8c21634ddbd3bffc3159266b44f21dbe10e


Though I have doubts regarding setup:

Ikiwiki should have another language added at some point (maybe we
need to translate a bit more for that)