Remove the Appendix "Please keep this for your records" or in German "Bitte bewahre dies für deine Unterlagen auf". Problem is that in Germany and many other countries there is a formal way of speaking to people.

In our case we use formal for all communication with our guests but this text isn't translated that way. That may be off-putting or probably even offensive for some. Because this note is added right at the footer field anyone could just add that to the footer text field in any way he like (formal or not).