Brazilian Portuguese language update

inc/lang/pt-br/conflict.txt

inc/lang/pt-br/denied.txt

inc/lang/pt-br/diff.txt

inc/lang/pt-br/lang.php

inc/lang/pt-br/login.txt

inc/lang/pt-br/newpage.txt

inc/lang/pt-br/resendpwd.txt

inc/lang/pt-br/wordblock.txt

lib/plugins/acl/lang/pt-br/help.txt

lib/plugins/acl/lang/pt-br/lang.php

lib/plugins/config/lang/pt-br/intro.txt

lib/plugins/config/lang/pt-br/lang.php

lib/plugins/plugin/lang/pt-br/admin_plugin.txt

lib/plugins/plugin/lang/pt-br/lang.php

lib/plugins/revert/lang/pt-br/intro.txt

lib/plugins/revert/lang/pt-br/lang.php

lib/plugins/usermanager/lang/pt-br/lang.php