translate more of 'Before you Get Started'

translations/README-ptbr.md

@@ -459,11 +459,9 @@ Faça o seu próprio grátis:
 - [Minha base de dados flashcards (antigo - 1200 cartões)](https://github.com/jwasham/computer-science-flash-cards/blob/master/cards-jwasham.db): 
 - [Minha base de dados flashcards (novo - 1800 cartões)](https://github.com/jwasham/computer-science-flash-cards/blob/master/cards-jwasham-extreme.db):
 
-Keep in mind I went overboard and have cards covering everything from assembly language and Python trivia to machine learning and statistics. It's way too much for what's required by Google.
+Keep in mind I went overboard and have cards covering everything from assembly language and Python trivia to machine learning and statistics. É demais para o que é exigido pelo Google.
 
-**Nota:** The first time you recognize you know the answer, don't mark it as known. You have to see the
-same card and answer it several times correctly before you really know it. Repetition will put that knowledge deeper in
-your brain.
+**Nota:** A primeira vez que você reconhece que sabe a resposta, não a marque como conhecida. Você tem que ver o mesmo cartão e respondê-lo várias vezes corretamente antes de realmente conhecê-lo. A repetição colocará esse conhecimento mais aprodundado em seu cérebro.
 
 An alternative to using my flashcard site is [Anki](http://ankisrs.net/), which has been recommended to me numerous times. It uses a repetition system to help you remember. 
 It's user-friendly, available on all platforms and has a cloud sync system. It costs $25 on iOS but is free on other platforms.