Maybe auth.messages is what you're looking for:
auth.messages.retrieve_username = 'Your user name: %(username)s'
auth.messages.retrieve_username_subject = 'Username retrieval'
auth.messages.reset_password = 'Click or copy/paste the following link https://'+request.env.http_host+URL('default', 'user', args='reset_password')+'?key=%(key)s to the address bar of your browser. Use the form to set a new password'
auth.messages.reset_password_subject = 'Password reset: '
Kind regards,
Annet