Oh, bah, I miss-read that. Sorry. Change that back. I thought you were saying you installed in the /en/ folder... My bad.
Everything seemed to work. When I click the menu link to one of my new site's dashboard, however, I'm simply taken to mydomain.com/wp-admin/.
Check in the menu and see what the link is there. If THAT is missing, /en/ or /pt/ then try turning off all your plugins. I recall a time when W3TC was causing that to get weird and stuck. There could be other plugins.