Translation Portuguese

Hello, how do I change the strings of Portuguese Brazil translation?

Is completely wrong, many translations can not understand.

For example:

Wrong: Endereço de correio-e:
Correct: Endereço de email:

Wrong: Palavra-passe
Correct: Senha

Wrong: Esqueceu-se da palavra-passe?
Correct: Esqueceu sua senha?

And many others.