{% load widget_tweaks %}
<div class="form-group {% if field.errors %}has-error{% endif %}">

    {% render_field field class+="form-control" %}

    {% for error in field.errors %}
        <div class="form-control-feedback">
            {{ error }}
        </div>
    {% endfor %}

    {% if field.help_text %}
        <small class="form-text text-muted">{{ field.help_text }}</small>
    {% endif %}
</div>