Misago/misago/templates/bootstrap3/layout/field_errors_block.html

{% if form_show_errors and field.errors %}
  <div class="control-errors">
  {% for error in field.errors %}
    <p id="error_{{ forloop.counter }}_{{ field.auto_id }}" class="help-block"><strong>{{ error }}</strong></p>
  {% endfor %}
  </div>
{% endif %}