[Pidgin] #600: pt_BR translation update for Pidgin 2.0.0

[Pidgin]

#600: pt_BR translation update for Pidgin 2.0.0
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 Reporter:  MauricioC     |       Type:  translation
   Status:  new           |   Priority:  minor      
Component:  pidgin (gtk)  |    Version:  2.0        
 Keywords:                |    Pending:  0          
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 This adds translation for a few strings that were changed post string
 freeze.

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Ticket URL: <http://developer.pidgin.im/ticket/600>
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