In order to change the transactional emails in Magento 2 go to Admin Panel > Marketing > Communication > Email Templates.
Then, choose an email template you want to edit or you can add a new one by pressing the Add New Template button.
When you adding a new template, please choose an email template you want to based on in the Template field and press Load Template button.
1. Set the name of the template in the Template Name field.
2. Change Template Subject and Content as you wish.
3. Add Template Styles (optional).
Once you have finished with the configurations don't forget to press the Save Template button.
If you have created a new template you need to assign it in the store configurations. As far as we have created a New Order Template in this guide we go Admin Panel > Stores >Setting > Configuration > Sales > Sales Emails (your path can be different depending on the template).
Then you need to find a template select box you are interested in, remove the checkmark Use system value and choose the template from the list.
After all of the configurations have been performed press the Save Config button and flush Magento caches.
In is way any transactional email template can be edited or translated.
1st Step: go to Marketing > Email Templates in order to edit or add a new template.
2nd Step: go Stores > Configuration > XYZ, find your template select box and change its value.