Translating Magento 2 email templates is an important step while setting up the multi-language store because they help you to not only establish a relationship with your worldwide customers, but improve your email marketing strategy.
In order to translate the email template in Magento 2, you have to create a new translated template on the basis of the existing Magento 2 email template.
So, follow these steps to translate the email template in Magento 2:
1. Navigate to Marketing > Communications > Emails Templates and press the Add New Template button.
2. Load Default Template you want to create the translation for. (we have chosen the New Order email template as an example)
3. Fill in the Template Information.
Once you've loaded the Magento 2 email template you want to translate, you need to fill such fields as Template Name and Template Subject.
4. Translate the Template Content and add the Template Styles if you want and Save the Template.
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✔ How to Customize Magento 2 Email Templates?
After the saving, you will see your template in the list of all Magento 2 templates.
5. Enable Template.
After that, you have to assign a newly created Magento email template in the store configurations. In order to do it navigate to Stores > Configuration > Sales > Sales Emails (your path can be different depending on the template). Here you change the Store View to the one you've made a translated email template for.
Once you've chosen the store view you want the Magento 2 email template to be sent from, set the translated template in the New Order Confirmation Template by removing the point from the checkbox and Save Config. (Confirmation Template Name differs in accordance to the template you have chosen)
Email Template Translation is just one of the series of articles about How to Configure Multi-Language Magento Website? which include information about the creation of a new store view, language packs installation, useful multi-language store extensions, product&category, CMS pages&blocks, and other translations in Magento 2 website. You should definitely get acquainted with them in order to know how to manage a multilanguage store.