Bug 17611: Change 'Pending order' to 'Quantity ordered'

Bug 17611: Change 'Pending order' to 'Quantity ordered'

Picking Quantity ordered as it seems more in line with
other pages in Koha where we show information. We always
show the quantity, so it makes sense to also have this
label on the 'order search' and 'copy existing order'.

Order search
1) Make sure you have some orders in your acq module
2) Go to the top and do an empty orders search
3) Review the column headings of the search results
4) Find "Pending order"

Order from existing order (copy)
1) Create or choose an existing open basket
2) 'Add to basket' - 'From existing orders'
3) Search to find some of your orders
4) Look at the column headings, find 'Pending order'
5) Pick some orders and fill out order information, save
6) Summary: Find 'Pending order' in the table again

x) Apply the patch and make sure all 'Pending' orders
above have been changed to 'Quantity ordered'.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Bouzid Fergani <bouzid.fergani@inlibro.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>