Bug 10193 - Copies should be holdings as label for items on MARC view

Bug 10193 - Copies should be holdings as label for items on MARC view

In the OPAC MARC view, the table of holdings is labeled 'copies.' In
order to be consistent with the normal view this should be labeled
'holdings.' This patch makes this correction.

To test, apply the patch and view the MARC detail page for any record
with items. The table of holdings data at the bottom of the page should
be labeled 'Holdings.'

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>