magento/magento2#: Remove unused “Default Email Domain” translation

Author: atwixfirster

app/code/Magento/Customer/i18n/en_US.csv

@@ -432,7 +432,6 @@ Strong,Strong
 "Default Value for Disable Automatic Group Changes Based on VAT ID","Default Value for Disable Automatic Group Changes Based on VAT ID"
 "Show VAT Number on Storefront","Show VAT Number on Storefront"
 "To show VAT number on Storefront, set Show VAT Number on Storefront option to Yes.","To show VAT number on Storefront, set Show VAT Number on Storefront option to Yes."
-"Default Email Domain","Default Email Domain"
 "Default Welcome Email","Default Welcome Email"
 "Email template chosen based on theme fallback when ""Default"" option is selected.","Email template chosen based on theme fallback when ""Default"" option is selected."
 "Default Welcome Email Without Password","Default Welcome Email Without Password"

app/code/Magento/Sales/Model/AdminOrder/Create.php

@@ -28,14 +28,6 @@
  */
 class Create extends \Magento\Framework\DataObject implements \Magento\Checkout\Model\Cart\CartInterface
 {
-    /**
-     * Path to "CUSTOMERS > Customer Configuration > Create New Account Options > Default Email Domain" setting
-     *
-     * @deprecated since version 2.2.6
-     * @see \Magento\Sales\Model\AdminOrder\Create. Constant usage has been removed from _getNewCustomerEmail() method.
-     */
-    const XML_PATH_DEFAULT_EMAIL_DOMAIN = 'customer/create_account/email_domain';
-
     /**
      * Quote session object
      *