Bug 29924: (follow-up) Add bug number to atomicupdate; Style OPAC message

Bug 29924: (follow-up) Add bug number to atomicupdate; Style OPAC message

- The atomicupdate didn't have "bug_number" defined.
- The "Your password has expired" message is now styled with the same
  class as other OPAC login messages.

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Bob Bennhoff <bbennhoff@clicweb.org>
Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>