pt-BR translation improved by Marcela Oliveira (#14180)

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11912 e93f8b46-1217-0410-a6f0-8f06a7374b81
use English "Tag" and "Branch" in pt-BR locale (#14180)

patch by Marcela Oliveira.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11913 e93f8b46-1217-0410-a6f0-8f06a7374b81