CAT-58 Bill Interface Print Additions

CAT-58 Bill Interface Print Additions

Add locale settings for Printing selected item.
Add context menu to Bill/Payment History interface.
Add Print Selected Item to Bill/Payment History Context menu.
Change Payment History Interface Print button to print all
items in list.

Signed-off-by: Kyle Huckins <khuckins@catalystdevworks.com>
	modified:   Open-ILS/web/opac/locale/en-US/lang.dtd
	modified:   Open-ILS/xul/staff_client/server/patron/bill2.xul
	modified:   Open-ILS/xul/staff_client/server/patron/bill_history.js
	modified:   Open-ILS/xul/staff_client/server/patron/bill_history.xul