Bug 30290: (follow-up) Add warning for translated notices

Bug 30290: (follow-up) Add warning for translated notices

Note: Problem is that we cannot know if default was translated
or en contains the original notice. Actually this holds for
the other languages too. So this is an educated guess without
using the lang field.

Test plan:
Run db rev.
Trigger the warning by replacing Pages by PPages in an AR notice.
Run db rev again.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>