How do I translate/change the text of the order receipt email in Commerce 2? The Commerce 2 documentation describes how to send a an order confirmation receipt:


Go to the Commerce admin page.
Choose order types.
Click edit for the relevant order type and check the box to email a receipt.


However, how do I translate the text of this receipt?  There appears to be no UI for this.
You can find the Subject on the UI translate page (/admin/config/regional/translate).  Search for Order #.

The rest can be found in a twig template:

/modules/contrib/commerce/modules/order/templates/commerce-order-receipt.html.twig

Copy this template to your theme and then edit as desired.  You can also use the template as a guide for what to search for on the translation UI screen to translate everything.