[Tails-l10n] [pt] more translations

Hi, we have some more translation contributions from pt team. Eager to see our
process become more solid. :-)

repo: git://git.sarava.org/tails.git
branch: doc/pt-br
commit: 4c2988266f0e245a8fe758ed1fdd0433f6c1c810

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o - aum...
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