{% set alts = get_alts() %}
<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">
    {{ this.alt }}
  </button>
  <div class="dropdown-menu">
    {% for alt in alts %}
      {% if this.alt != alt %}
      {% for thing in alt %}
        <a class="dropdown-item" href="{{ this.path|url(alt=alt) }}">{{ thing }}</a>
      {% endfor %}
      {% endif %}
    {% endfor %}
  </div>
</div>