New options translated.

I'd like to point out that the extension is not updating automatically on Chrome. I had to remove it and install it again to get the updated translations and options.

There is no "Contributors" message to translate. That said, I added the line:
"m64": { "message" : "Contribuintes:" }
translated to english it means "Contributors".

Also, the Github icon message, under the Help & Info tab, is not being translated as it should be by using the line:
"m58": { "message" : "Repositório do GitHub!"}