Bug 12318: Show shelving location on subscription tab in OPAC and staff

Bug 12318: Show shelving location on subscription tab in OPAC and staff

The shelving location can be helpful to locate an item in the library.
Especially, if the library has decided not to create items for a
subscription this information is currently not visible to the patron.

To test:
- Apply patch
- Create a subscription, set location
- View the subscription tab in detail and staff
- Verify that the location now shows above the callnumber
- Unset location in the subscription
- Verify that the page still looks ok

Signed-off-by: Mikaël Olangcay Brisebois <mikael.olangcay-brisebois@inLibro.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>