td.twig

<a {% for attr, value in options %} {{ attr }}="{{ value }}"{% endfor %}>
    {{ title }}
{% if options.class == 'sortable' %}
<span class="glyphicon glyphicon-sort" aria-hidden="true"></span>
{% elseif options.class == 'asc' %}
    <span class="glyphicon glyphicon-sort-by-attributes" aria-hidden="true"></span>
{% else %}
    <span class="glyphicon glyphicon-sort-by-attributes-alt" aria-hidden="true"></span>
{% endif %}
</a>