Bug 7960: Add class to item type descriptions so they can be hidden with CSS

Bug 7960: Add class to item type descriptions so they can be hidden with CSS

This patch adds the class "itypetext" around item type descriptions so
they can easily be hidden with CSS.

To test:
1. Navigate to the pages listed below to confirm that the text
descriptions do show.
2. Add
.itypetext { display:none; }
to IntranetUserCSS and OPACUserCSS system preferences and save.
3. Go back to the pages listed below and confirm that the text
descriptions DO NOT show.

= STAFF CLIENT =
 - catalogue/advsearch.tt
 - catalogue/detail.tt
 - catalogue/results.tt
 - reserve/request.tt
 - virtualshelves/shelves.tt
= OPAC =
 - opac-advsearch.tt
 - opac-detail.tt
 - opac-readingrecord.tt
 - opac-reserve.tt
 - opac-shelves.tt
 - opac-user.tt

Refer to David Nind's test notes from Comment 23 for a more detailed
plan for acessing these pages.

Sponsored-by: Catalyst IT
Signed-off-by: Charles Farmer <charles.farmer@inLibro.com>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>