[Gelöst] E-Mail translation Issue with wp_new_user_notification_email hook

We have an E-Mail translation Issue with wp_new_user_notification_email hook. We need to adjust the wordpress standard (notification after admin created new user) email, but changing it with the hook it just does not translate to other langauges.

There must be some cases, where people needed this to be changed .. do you know how to get this working?

The support send me this: https://wpml.org/documentation/support/sending-emails-with-wpml/

But until now it did not work.