Bug 19719: (follow-up) Show description instead of code

Bug 19719: (follow-up) Show description instead of code

This follow-up changes the display from collection code
to description, following the existing pattern for
location.

To test:
- Repeat test plan from first patch
- Verfiy now the collection descrption shows
- Change column setting in administration
- Verify they work as expected

Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>