build: Clean pkg/docker/console.min.html

Reviewed-by: Stef Walter <stefw@redhat.com>
build: Add "undef" to jshint.conf and clean up accordingly

Closes #1557
Signed-off-by: Stef Walter <stefw@redhat.com>
 * No jQuery global in cockpit.js
 * Added proper po loading instead of ignoring problems