[tldoc] New translation for TL: Brazilian Portuguese (pt.po)

[Karl Berry]

Hi Paulo,

    First of all, apologies for sending the translation directly to the TL

No problem at all.  I would have answered there but you corrected
yourself before I had a chance :).

    I've translated all the TeX Live 2011 messages to Brazilian Portuguese. 

Great, thanks!  Will add them shortly.

    I'm not sure, does TL support country codes, say, pt_PT.po and
    pt_BR.po to be mapped accordingly?

I'm not sure either.  Norbert?

Thanks,
Karl