Bug 16026 - Use Font Awesome icons on cataloging home page

 Bug 16026 - Use Font Awesome icons on cataloging home page

The cataloging home page has one instance of a Glyphicon. This patch
replaces it with a Font Awesome icon.

To test you must have the EnableAdvancedCatalogingEditor preference
enabled.

- Apply the patch and go to the Cataloging home page.
- Confirm that the "Advanced editor" button uses the "pencil" icon and
  that it still works correctly.

Signed-off-by: Nicole C Engard <nengard@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>