That's the following language string.
Key: A_PAYMENT_BASKET_IS_PENDING_IN_PROGRESS_FOR_PAYMEN_adc904
String:
Code:
A payment basket is pending in progress for payment for this. Are you sure that you didn't already pay for this? Here you can pay again:
You can translate it or change it using language overrides functionality shown below.
www.joomlapolis.com/blog/kyle/18701-language-overrides-have-arrived