Bug 10752: Alert the librarian if the suggestion has not been added

Bug 10752: Alert the librarian if the suggestion has not been added

Test plan:
- Create a new suggestion, chose a short term as your title and copy it.
- Leave all other fields of the suggestion form untouched.
- Save your first suggestion.
- Enter a second suggestion with the same title.

Before this patch, the suggestion was not inserted without alert.
With this patch, an alert is displayed on the interface.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
NOTE: Love the simplicity and ability to expand. :)

Tested with all pateches applied. Wors as expected.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
(cherry picked from commit 81ab20e6bbf988b4f9613f63cd799a28e8296208)
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>