It is not possible to change the quotation introduction added when answering mail.Andre Klapperak-47@gmx.netChanging the "On date, person wrote:" string when replying
Advanced users can change this string.
Open the dconf-editor application.
Navigate to org.gnome.evolution.mail.
Enter the prefered quotation string as the value for the key composer-message-attribution.
You might need to install the dconf-editor package to perform these steps.