Where are email templates stored for calendar?

I would like the change the text of the email that goes out when you invite an external contact to an event via Nextcloud calendar.

The email template is like:
John invited you to >>‘Event Name’ Event<<
When:
‘Event Date’, ‘Event Time’ ‘Timezone’

Where would i find the email template so that I can change the text of this email?

I am using Nextcloud 18.0.4 with the official Calendar extension.

It’s done programmatically, there’s no template for this part.