oca-ocb-security/odoo-bringout-oca-ocb-google_gmail/google_gmail/views/templates.xml

<?xml version="1.0" encoding="UTF-8"?>
<odoo>
    <template id="google_gmail_oauth_error">
        <t t-call-assets="web.assets_frontend" t-js="false"/>
        <div class="py-5">
            <div class="alert alert-warning w-50 mx-auto" role="alert">
                <t t-out="error"/>
                <br/>
                <a t-att-href="redirect_url">
                    Go back
                </a>
            </div>
        </div>
    </template>
</odoo>