Add Portuguese (BR) translation by Gemini Saga

 * Source: http://forums.fortress-forever.com/showpost.php?p=447839&postcount=74 and http://forums.fortress-forever.com/showpost.php?p=447930&postcount=82

* Our font currently struggles with the extended ascii characters (doesn't draw them at all). Might want to resolve that before merging this.
* Not sure why Github detects these as binary; they do need to be encoded in UTF-16 LE with BOM, so that might be it, but it might also be due to the blank .gitattributes file. I ain't know.