Bug 12913: [QA Follow-up] Reword 'change item status' and add zero status

Bug 12913: [QA Follow-up] Reword 'change item status' and add zero status

The zero status should be added in @notforloans. It is a legitimate status
for available books. The zero status description can be translated in
the template.
The 'Change item status' is confusing. We mean that we saw a notforloan
status that we do not expect (read: does not exist in the table).

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 664d6534171677455f3cf1467e8726146714133a)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>