Hi @user8139,
If you only want to change the text, go to the back office: https://i.imgur.com/537j4qr.png
If you want to change something other than the text, go to / root / mails / language / and change the preferred mail template.
Make a backup of the template file before editing it.
https://i.imgur.com/dJiRHRy.png
Kind regards,
Leo