{% load i18n %}
<select class="criterion-operator" name="operator-{{id}}">
    <option value="10" {% ifequal operator 10 %}selected="selected"{% endifequal %}>{% trans 'Is selected' %}</option>
    <option value="11" {% ifequal operator 11 %}selected="selected"{% endifequal %}>{% trans 'Is not selected' %}</option>
</select>