Hi,
I've attempted to change the wording for a customer notification by going to Project Settings>Customer Notifications and then clicking Edit for the correct Default rule.
Having changed the text and hit save, the customer is still receiving the default text ("Wir wollten nur bestätigen, dass wir Ihre Anfrage erhalten haben. Wir arbeiten dran.") even though when I send a test email to myself the wording is correct ("Vielen Dank für Ihre Anfrage - sie ist im Ticketsystem unter der Nummer BB-8 vermerkt und wird so schnell wie möglich persönlich bearbeitet.").
The question has been asked three years ago by someone else, but unfortunately, her/his request didn't lead to a solution. Perhaps I'll be more lucky? 
Thanks a lot in advance!