Add Brazilian Portuguese translation for some common pages

[schneiderl]

Translated first five pages in Portuguese.

I'm planning to translate more in the near future.

Regarding the folder name: I have created the folder based on IETF language codes (BCP 47) as it was discussed on gitter. The link for the start of the discussion can be found here.

As this is my first contribution for this repository I would like to know if there is anything missing from my side.
Thanks a lot.

[CLAassistant]

All committers have signed the CLA.

[waldyrious]

Thanks for kickstarting the Portuguese translation, @schneiderl! I added some comments inline (in Portuguese), and some small fixes (mostly missing diacritics). Please address them when you can.

[agnivade]

Finally we have a member who can review a translation !

[schneiderl]

I have commited the fixes and made the required changes.
@waldyrious can you please check them? Specially the comments on ack.md.

[waldyrious]

As this is my first contribution for this repository I would like to know if there is anything missing from my side.
Thanks a lot.

@schneiderl your first contribution has been merged! 🎉

As for feedback -- I'd recommend not duplicating the PR message content in the commit message, since they serve different purposes. The commit message should only describe the change itself, rather than mention plans for the future, ask for feedback, etc. Those messages are appropriate in the PR opening comment and the following discussion, though.

You might want to check out @cbeams' excellent write-up on what makes a good git commit message.

[schneiderl]

Thanks a lot for the feedback 👍