You can customize the output of django-bootstrap3 by writing your own templates. These templates are available:
This renders the help text and error of each field.
Variable help_text_and_errors contains an array of strings.
This renders the non field errors of a form.
Variable errors contains an array of strings.
This renders the Django messages variable.
Variable messages contains the messages as described in https://docs.djangoproject.com/en/dev/ref/contrib/messages/#displaying-messages
There are two more templates, bootstrap3/bootstrap3.html and bootstrap3/pagination.html. You should consider these private for now, meaning you can use them but not modify them.