magento-test/app/code/Magento/Backend/Test/Mftf/ActionGroup/SetAdminAccountActionGroup.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">
    <actionGroup name="SetAdminAccountActionGroup">
        <annotations>
            <description>Update the Interface Language configuration setting using provided Interface Language.</description>
        </annotations>
        <arguments>
            <argument name="InterfaceLocaleByValue" defaultValue="en_US" type="string"/>
        </arguments>
        <!-- Navigate to admin System Account Page-->
        <amOnPage url="{{AdminSystemAccountPage.url}}" stepKey="openAdminSystemAccountPage" />
        <waitForElementVisible selector="{{AdminSystemAccountSection.interfaceLocale}}" stepKey="waitForInterfaceLocale"/>
        <!-- Change Admin locale to Français (France) / French (France) -->
        <selectOption userInput="{{InterfaceLocaleByValue}}" selector="{{AdminSystemAccountSection.interfaceLocale}}" stepKey="setInterfaceLocate"/>
        <fillField selector="{{AdminSystemAccountSection.currentPassword}}" userInput="{{_ENV.MAGENTO_ADMIN_PASSWORD}}" stepKey="fillPassword"/>
        <click selector="{{AdminMainActionsSection.save}}" stepKey="clickSave"/>
        <waitForElementVisible selector="{{AdminMessagesSection.success}}" stepKey="waitSuccessMessage"/>
        <see selector="{{AdminMessagesSection.success}}" userInput="You saved the account." stepKey="seeSuccessMessage"/>
    </actionGroup>
</actionGroups>