/usr/lib/python2.7/dist-packages/crispy_forms/templates/bootstrap4/layout/fieldset.html is in python-django-crispy-forms 1.7.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | <fieldset {% if fieldset.css_id %}id="{{ fieldset.css_id }}"{% endif %}
{% if fieldset.css_class or form_style %}class="{{ fieldset.css_class }} {{ form_style }}"{% endif %}
{{ fieldset.flat_attrs|safe }}>
{% if legend %}<legend>{{ legend|safe }}</legend>{% endif %}
{{ fields|safe }}
</fieldset>
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