Bug 25650: Add location and itype descriptions in ILS-DI GetRecords

Bug 25650: Add location and itype descriptions in ILS-DI GetRecords

Test plan:
1. Create a record with an item, and set the item's shelving location
and itemtype.
2. Go to
http://<OPAC>/cgi-bin/koha/ilsdi.pl?service=GetRecords&id=<biblionumber>
3. Check that there is <itype_description> and <location_description>
and that their value is correct.

Signed-off-by: Arthur Suzuki <arthur.suzuki@biblibre.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>