Added full Brazillian Portuguese Translation

Morris requested to merge tkmorris/sleepyhead-code:pt_br into master

Hi, I've previously translated other projects (such as Mumble, Wikipedia,, et al.) and only recently have found out about SleepyHead. What a nice surprise to find amazing free software in this niche area. Hopefully this is the intended process for adding entirely new translations, thanks in advance for your guidance!

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