I would like to change the text in the success page of the form module. After sending an e-mail by a not registered (anoynmous) user, the success page always contains this green coloured string: "Versand einer E-Mail Bestätigung ist nicht möglich! Drucken Sie bitte diese Nachricht aus!" - Telling the user he should print the success page. I would like to change the string. In form -> languages I could find the defined strings in different languages. However, changing the language file does not change the string on the success page after sending an e-mail (see screenshot).
Does anyone know where I can change this?