Bug 24127: Add 'code' and title to shelving location search

Bug 24127: Add 'code' and title to shelving location search

This patch attempts to clarify the 'Shelving location' option in the
staff side dropdown, as it requires searching the shelving location code, not
the values. i.e. 'FIC' not 'Fiction'

This patch adds (code) to the option and adds a title, visible on hover

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>