'contribution_dupalert' => ts('Contributions - Duplicate Organization Alert', array('escape' => 'sql')),
'contribution_offline_receipt' => ts('Contributions - Receipt (off-line)', array('escape' => 'sql')),
'contribution_online_receipt' => ts('Contributions - Receipt (on-line)', array('escape' => 'sql')),
+ 'contribution_invoice_receipt' => ts('Contributions - Invoice', array('escape' => 'sql')),
'contribution_recurring_notify' => ts('Contributions - Recurring Start and End Notification', array('escape' => 'sql')),
'contribution_recurring_cancelled' => ts('Contributions - Recurring Cancellation Notification', array('escape' => 'sql')),
'contribution_recurring_billing' => ts('Contributions - Recurring Billing Updates', array('escape' => 'sql')),