/usr/lib/python2.7/dist-packages/crispy_forms/templates/bootstrap4/layout/tab-link.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 | <li class="tab-pane{% if 'active' in link.css_class %} active{% endif %}"><a href="#{{ link.css_id }}" data-toggle="tab">{{ link.name|capfirst }}{% if tab.errors %}!{% endif %}</a></li>
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