Bug 29052: Make consistent use of spans and div with hint class

Bug 29052: Make consistent use of spans and div with hint class

This patch makes minor HTML corrections to several templates, primarily
to wrap form help text in <span class="hint"> or <div class="hint">.

To test, apply the patch and rebuild the staff interface CSS
(https://wiki.koha-community.org/wiki/Working_with_SCSS_in_the_OPAC_and_staff_client).

View the following pages to confirm that forms look correct:

- Administration -> Authority types -> Authority type -> Edit.
- Administration -> Authority types -> Authority type -> MARC structure.
  -> Subfields -> Edit.
- Administration -> Authorised values -> View category -> New authorized
  value.
- Administration -> Credit types -> New credit type.
- Administration -> Debit types -> New debit type.
- Administration -> Item types -> New item type.
  Also changed: Added link to ITEMTYPECAT authorized value page for
  users with the correct permission.
- Administration -> MARC frameworks -> MARC structure -> Edit subfields.
- Administration -> Patron attribute types -> New patron attribute type.
- Administration -> Share content with Mana KB.
- Administration -> Z39.50/SRU servers -> New Z39.50 server.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>