WHERE can I change the notification email message for role assigments?
Per TR on the Ubercart forums:

"You may change this text under the Conditional Actions settings:
/admin/store/ca/uc_role_notify_revoke/edit/actions"

http://www.ubercart.org/forum/support/32739/where_can_i_change_notification_email_message_role_assigments#comment-70607