How to change "Additional Information" w/PO plugin

-- HikaShop version -- : latest
-- Joomla version -- : 3.3.0
-- PHP version -- : 5.5.11
-- Browser(s) name and version -- : IE11

This is what is emailed to the user at the bottom of the email when they choose the Purchase Order payment plugin:

Additional information
Your order will be processed as soon as your payment is received.

How can I change the "Your order will be..." line for Purchase Order option only?

Hello,
The solution will probably be directly edit the value of the "ORDER_VALID_AFTER_PAYMENT" translation word via "Hikashop->System->Configuration->Languages".

That's for all payment options.

Nicholas made a Purchase Order plugin, and the options in the Hikashop interface do not include custom messages.