Hi @basvweb ??
What you could do in the meantime, in case that you would like to do this by editing your WooCommerce core files, you can do it by going to woocommerce/templates/emails/email and from there, edit the file email-order-details.php
Once you are there, around line 23, you will find this code:
https://www.screencast.com/t/wtt9W91wa
When you find it, please feel free to remove the #, save the changes and check if that works for you!
Bear in mind that doing it this way, will probably be overwritten when the WooCommerce plugin updates.
Also, make sure you have a good backup in place of your full site and database. If something goes wrong, it’s nice to know that you can restore your site.
Cheers ??