Bootstrap Alerts for Django

messages.html

{% if messages %}
  {% for message in messages %}
  <div class="alert alert-{{ message.tags }} alert-dismissible text-center" role="alert">
    <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
    <strong>{% if message.level == DEFAULT_MESSAGE_LEVELS.ERROR %}Error{% else %}{{ message.tags|title }}{% endif %}!</strong> {{ message }}
  </div>
  {% endfor %}
{% endif %}

settings.py

from django.contrib.messages import constants as messages

MESSAGE_TAGS = {
    messages.ERROR: 'danger'
}