Bug 11400: Show "Log in as a different user" in the error message instead of the...

Bug 11400: Show "Log in as a different user" in the error message instead of the "Logout" button

Bug 11146 introduced a way to go back, and have a logout link for the
"Not enough permissions" message page. I belive the logout button is redundant. And
also "Log in as a different user" tells the user more about its options on the scenario.

Simple and disputable usability/string change.
Regards
To+

Sponsored-by: Universidad Nacional de Cordoba
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>