Storefront language and custom error message for payments

We've added an option to display a custom errror message in storefront for failed payment requests in the return URL:

https://app.ecwid.com/custompaymentapps/805056?orderId=65306446&clientId=redsys-integration&errorMsg=My%20error%20message

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Also, Ecwid sends the storefront's language in the payment request now:

860

Use it to show payment processor interface and error messages in correct language.