How to remove email marketing notification after checkout?

I want to remove the notification of successful registration at checkout when a customer register to newsletter.

Hello, tolis88gr!

Please copy your request on and we will help.

Best regards,

It looks like notification from 3rd party module. Try to contact addon developer

Its from email marketing addon of cs-cart.

I have just checked language variables (popup title and content) and failed to find such values on the clean installation