Bug 15963: Use Font Awesome icons for confirmation after deleting MARC tag

Bug 15963: Use Font Awesome icons for confirmation after deleting MARC tag

This patch revises the dialog which appears after you have deleted a
MARC tag.

To test, apply the patch and go to Administration -> MARC frameworks ->
MARC sturcture -> Delete.

- Confirm that you want to delete a MARC tag.
- Verify that the confirmation dialog you are shown is styled correctly.
- Verify that clicking "OK" redirects you to the right place.

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Works as advertised

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