Updated Brazilian Portuguese translation

Updated pt_BR translation for pcsx2_Iconized file
Updated Brazilian Portuguese translation

Updated pt_BR translation for pcsx2_Main file
Keep previous translation

When updating existing PO files with the newly created POT files, keep previous msgids of translated messsages (as fuzzy). This allows translators to compare previous and current msgid strings and then identify what has changed, resulting in a faster translation activity and a more consistent GUI.
Merge pull request #152 from josephgbr/master

Update Brazilian Portuguese translation