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I did not bother updating links for ancient contents.

Currently translated at 17.7% (11 of 62 strings)

Translation: Tails/wiki/src/news/version_3.14.1.*.po
Translate-URL: http://translate.tails.boum.org/projects/tails/wikisrcnewsversion_3141po/pt/

Currently translated at 39.0% (16 of 41 strings)

Translation: Tails/wiki/src/news/version_3.11.*.po
Translate-URL: http://translate.tails.boum.org/projects/tails/wikisrcnewsversion_311po/it/

- Change it to a class to be more semantically correct when used as a
  style on blog posts.
- Use a more specific name when used as a button to PayPal on /donate.
- Improve the note about .donate-button in local.css.