Bug 15102: Fix capitalization for some strings on XSLT detail pages

Bug 15102: Fix capitalization for some strings on XSLT detail pages

To test:
-Search records with 336, 337, 338, 700$i, and 7XXind=2
-Search records with 508, 264Ind=4, 246, 856, and LDR/6 and
LDR/7 (BK, VM, CR, CF)
-Notice the capitalization (Contained Works, Related Works, Media Type,
Content Type, and Carrier Type, Production Credits, Copyright Date,
Other Title, Online Access, Continuing Resource, Mixed Materials,
Computer File, Visual Material) in both OPAC and Intranet for
records detail pages and results pages
-Apply this patch
-Search again and get notice about the capitalization following
Koha coding guidelines

Signed-off-by: Frederic Demians <f.demians@tamil.fr>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>