Bug 10040: Capitalization wrong when deleting subfields from authority

Bug 10040: Capitalization wrong when deleting subfields from authority

Confirmation message for deleting subfields from an authority framework
has wrong capitalization.

To reproduce:
1) Go to Administration > Authority types
2) Click on MARC structure for one of the authority types
3) Click on the subfields link for one of the fields
4) Delete one of the subfields

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Passed-QA-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>