[Tails-l10n] (pt) Translation updates

The following changes since commit b1c1bba690743f3595a7324776e1a65b919e3891:

Fix announcement (2014-05-20 14:57:46 +0200)

are available in the git repository at:

git://git.sarava.org/tails doc/pt

for you to fetch changes up to 0ce5dc3291235b76fa31707a4fdc75afc7ba9796:

Fix small pt translation term in 0.23 security announcement. (2014-05-23 15:16:39 -0300)

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