Bug 36950: Improve placement of catalog concern banner in the OPAC

Bug 36950: Improve placement of catalog concern banner in the OPAC

This patch changes the placement of the catalog concern banner in the
OPAC. Changing the way it is added to the DOM will prevent it from
obscuring content.

To test, apply the patch and clear your browser cache if necessary.

- In the staff interface, make sure the "OpacCatalogConcerns" system
  preference is enabled.
- Locate a bibliographic record and view the detail page.
- Click the "Report a concern" link in the sidebar.
- Submit your concern.
- When the concern is successfully submitted and the modal closes, the
  success banner ("Your concern was successfully submitted.") should
  appear below the breadcrumbs menu and above the biblio view tabs
  ("Normal view, "MARC view", etc.).

Sponsored-By: Athens County Public Libraries
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>