Backend Printing not working in two languages

Hi piffpaffpuff!

thanks for the plugin! It’s working very well. Also with qtranslate. But it only works for the frontend. When I am printing from the backend I have both translations on the bill/delivery note.

E.g: I have “Thanks for your Order” at the end – and beneath it says “Vielen Dank für die Bestellung” – when I print it out from the frontend Users Account it’s working without problems.

FrontEnd Link (correct):
http://mywebsite.com/mein-konto/print-order/123/?print-order-type=receipt&lang=de

Backend Link (not correct):http://mywebsite.com/admin-ajax.php?print-order=123&print-order-type=invoice&action=print_order

Any idea to get it working from out of the backend?

Thanks!
Using latest Plugin release.

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https://wordpress.org/plugins/woocommerce-delivery-notes/