LP1896081 Repair staff catalog filter expansion error

LP1896081 Repair staff catalog filter expansion error

Simplifies an i18n structure that was leading to this error when
expanding the staff catalog filters section:

ERROR DOMException: Failed to execute 'appendChild' on
'Node': The new child element contains the parent.
    at EmulatedEncapsulationDomRenderer2.appendChild

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Mary Llewellyn <mllewell@biblio.org>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>