base: implemented language button: - `component.menu` can now be used with a `{% call %}`, allowing extra HTML to be added after in the <nav> element - a language dropdown is shown if more than one translation is available, allowing to change page locale - if javascript is available, only the dropdown is visible, and changing it reload the page with new locale - if javascript is not available, a submit button is display to change the locale

{% if days_left is defined %}
    {% if days_left > 0 %}
        <div class="event__counter box">
            {% trans %}
                {{days_left}} day left
            {% pluralize %}
                {{days_left}} days left
            {% endtrans %}
        </div>
    {% else %}
        <div class="event__counter box">{% trans %}the event is finished{% endtrans %}</div>
    {% endif %}

{% endif %}