Bug 16046 - Use Font Awesome icons on patron edit pages

 Bug 16046 - Use Font Awesome icons on patron edit pages

This patch updates links in the patron edit and batch patron
modification templates to use Font Awesome icons instead of
background-images.

To test you must have ExtendedPatronAttributes enabled and at least one
repeatable attribute defined.

- Apply the patch and edit any patron record.
- In the section for editing attributes and identifiers, check the
  styling and behavior of the "Clear" and "New" links.
- In Tools -> Batch patron modification, load a batch of patron records.
- In the "Edit" form, check the style and behavior of the "Clear" link
  for date inputs.
- Test the "New" and "Delete" links for patron attributes.

Signed-off-by: Christian Stelzenmüller <christian.stelzenmueller@bsz-bw.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>