Bug 37931: Fix OPAC item type facet label

Bug 37931: Fix OPAC item type facet label

To test:
1. Have additional language installed and set up for OPAC
2. Search something
3. Notice "Item types" facet label untranslated
4. Apply patch and make sure translations are updated
5. Observe facet label "Item types" translated
6. See patch [1] "Bug 36750: Fix some labels" in Bug 36750
7. Observe item type change missing for OPAC but present in staff client

[1] https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=166289

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>