xmpp.chapril.org-conversejs/src/templates/change_status_message.html

<form id="set-custom-xmpp-status">
    <span class="input-button-group">
        <input type="text" class="custom-xmpp-status" {{status_message}}
            placeholder="{{label_custom_status}}"/>
        <button type="submit">{{label_save}}</button>
    </span>
</form>