Bug 33247: Flag the authority pending deletion in the result list

Bug 33247: Flag the authority pending deletion in the result list

When an authority is removed from the result list it is not removed from
the search engine yet.
This patch suggests to add a note in the summary column to tell the user
that the deletion is pending.

Test plan:
1 - Go to authorities home and perform a search;
2 - Delete any authority;
3 - After the confirmation, the page is refreshed but still contains the
deleted authority, with a red note explaining that the deletion is
pending.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>