Queerscriptors.org/templates/lang-selector.html

{% set alts = bag('alternatives').items() %}
<div class="btn-group dropdown pull-right">
  <button type="button" class="btn btn-dark bg-dark dropdown-toggle btn-block my-3 my-sm-0" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    {{ bag('alternatives', this.alt, 'language') }}
  </button>
  <div class="dropdown-menu">
    {% for id, item in bag('alternatives').items() %}
      {% if this.alt != id %}
        <a class="dropdown-item" href="{{ this.path|url(alt=id) }}">{{ item.language }}</a>
      {% endif %}
    {% endfor %}
  </div>
</div>