Bug 17134: Replace item types codes with category in facets (opac)

Bug 17134: Replace item types codes with category in facets (opac)

To test:
-Search in OPAC for two or more items
-Note that item types display category codes rather than names
-Make change to file and test in OPAC

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 908163754010df8d78acf463d6777ba2c4c3a2e9)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>