Merged r11911 from trunk to 2.3-stable (#14182, #14180)

pt-BR translation for 2.3-stable updated by Marcela Oliveira.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/2.3-stable@11914 e93f8b46-1217-0410-a6f0-8f06a7374b81