magento-test/app/code/Magento/User/Test/Mftf/ActionGroup/AdminCreateUserWithRoleAndSetLocaleActionGroup.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 /**
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
-->
<actionGroups xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/actionGroupSchema.xsd">
    <!-- Create new user with role and locale setting-->
    <actionGroup name="AdminCreateUserWithRoleAndLocaleActionGroup" extends="AdminCreateUserWithRoleActionGroup">
        <arguments>
            <argument name="interfaceLocale" defaultValue="en_US" type="string"/>
        </arguments>

        <selectOption selector="{{AdminNewUserFormSection.interfaceLocale}}" userInput="{{interfaceLocale}}" stepKey="setInterfaceLocate" after="confirmPassword"/>
    </actionGroup>
</actionGroups>