Bug 33596: Merge result page is missing page-section

Bug 33596: Merge result page is missing page-section

This patch adds a "page-section" container around the contents of the
page seen when you complete the process of merging catalog records.

The patch also adds the "merge was successful" message into the standard
message dialog.

Perform a catalog search which will return more than one record.

- Select two records in your search results and click "Edit" -> "Merge
  records."
- Complete the process of merging your selected records.
- On the last page you should see a "merge was successful" message
  styled as the standard information box.
- The "Report" section should be shown inside a "page-section" div.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>