Translation updates: pt_BR

Hi,

This is a fully reviewed version of pt_BR message files. Please apply
it to HEAD.

http://br.geocities.com/eulerto/pg/nls_pt-br.tgz

This another one, just resolved some fuzzy translations in 7.4. Please
apply it to 7.4 branch.

http://br.geocities.com/eulerto/pg/postgres.po.gz

=====
Euler Taveira de Oliveira
euler[at]yahoo_com_br

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