The payment acceptance mark helps visually indicate to your customers the different form of payment methods that are accepted during checkout such as Amex, MasterCard or Amex. It can be changed in the same way as any static text through the site's Admin > Languages page. Click on edit for the site and language of your choice. 

Drill down the tree node, where <_default> is the standard templates or your portal number if you have created custom display templates. <StandardX> is which ever template version you're currently using.

Local Resources
    DesktopModules
        Revindex.Dnn.RevindexStorefront
            Portals
                <_default>
                    Display
                        Checkout
                            <StandardX>
                                App_LocalResources
                                    Display.ascx

Look for the resource names and change the text (or HTML) to how you want it to be shown. Save and your checkout will start using the new localized acceptance mark.

• CashPaymentMethodListItem.Text
• CheckPaymentMethodListItem.Text
• CreditCardPaymentMethodListItem.Text
• MoneyOrderPaymentMethodListItem.Text
• PayFastPaymentMethodListItem.Text
• PayPalPaymentMethodListItem.Text
• WireTransferPaymentMethodListItem.Text