E-Mail confirmation “Appointments”

Hello there,

I have a short question: I am not using the plugin in english and when the customer/ visitor gets the automatic e-mail confirmation it says “Appointments” on top before it sums up date, time etc.
How/ where can I change it? It can also disappear but since the rest is in another language this is quite bothering…

Thank you very much in advance for your time and help!