EDIT INVITATION MAIL

Hello
I try to setup this plugin to edit the invitation mail received by people when I create a user :

Hi,
You’ve been invited to join ‘xxx’ at
https://xxx.yy with the role of Subscriber.
If you do not want to join this site please ignore
this email. This invitation will expire in a few days.

Please click the following link to activate your user account:

I have multi-site 5.7 version…..

Thank you