Bug 27439: Improve hint labels on patron attribute type entry form

Bug 27439: Improve hint labels on patron attribute type entry form

This patch makes some minor changes to the patron attribute type
template in order make corrections and improve consistency:

- Change some generic <span>s to <div class="hint">
- Correct terminology: Branch -> Library
- Improve hint text:
  Before: "Select All if this attribute type must to be displayed all
  the time."
  After: "Select "All libraries" if this attribute type should always
  be displayed"
- Link reference to authorized values "PA_CLASS" directly to that page
  for users with permission.

To test, apply the patch and go to Administration -> Patron attribute
types -> New patron attribute type.

 - Confirm that the hints on these fields are properly styled:
   Authorized value category, Library limitation, Category, and Class.
 - Confirm that the text uses the term "library" instead of "branch."
 - Confirm that the hint on the "Class" field links directly to
   authorized values if you are logged in with a user with permission.

Signed-off-by: Victoria Faafia <vfaafia29@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>