Bug 35236: Make "Batch description" label match corresponding <input> field

Bug 35236: Make "Batch description" label match corresponding <input> field

To test:
  1. Create a new patron.
  2. Go to Tools -> Patron card creator.
  3. Create a new patron card batch.
  4. On the "Edit patron card batch" page, click the "Batch
     description:" label.
  5. Observe that the corresponding <input> field is selected.

Mentored-by: Catalyst Academy
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>