[Tails-l10n] [review] move known_issues translations

Hello, when the known_issues page was split recently, translations was
not move to the new graphics page.

With this branch I do it for es, fa and pt. I also translate html and
terminal things.

Please review.

Repo: https://git-tails.immerda.ch/xin/tails/
Branch: move_known_issues_translations
Last Commit: f7ee3919b329dbc3461f055b634bba64a1e6d929

Cheers.
xin