<form class="pure-form add-xmpp-contact">
    {[ if (o.error_message) { ]}
        <span class="pure-form-message error">{{{o.error_message}}}</span>
    {[ } ]}
    <input type="text"
        name="identifier"
        value="{{{o.value}}}"
        class="username {[ if (o.error_message) { ]} error {[ } ]}"
        placeholder="{{{o.label_contact_username}}}"/>
    <button class="pure-button button-primary" type="submit">{{{o.label_add}}}</button>
</form>
