userportal, webadmin: change wording of hover message for Ctrl-Alt-Del passing

Change-Id: I4d1f59dcebe331d256f2c6d9d5c5bc1b4aaf8e93
Bug-Url: https://bugzilla.redhat.com/964249
Signed-off-by: Michal Skrivanek <michal.skrivanek@redhat.com>