[Tails-l10n] [review]spanish updates

Hello:

this updates have been reviewed for language (in fact, several of them are style corrections) but it would not be bad a technical review, to spot any troubles as in the (unrelated to this review request) commit:

https://git-tails.immerda.ch/emmapeel/tails/commit/?h=seguridad-fix&id=a92f61622e6de6c308e95615d64642c66f3f6c05


please review branch:
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To git.tails.boum.org:emmapeel/tails
 * [new branch]            spanish-afterlaunch -> spanish-afterlaunch