Bug 21709: Replace 'no popup' plugin links with a span

Bug 21709: Replace 'no popup' plugin links with a span

Test plan:
Edit a bibliographic record
Notice that the icons next to fields linked with a plugin can be a link
or not. The browser displays a pointer or not.

It will remove the ambiguity to display an icon that is clickable but
does nothing when clicked.
We could also have another icon to disociate both behaviors.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>