netbox-community-netbox/netbox/templates/dcim/devicerole_edit.html

{% extends 'utilities/obj_edit.html' %}
{% load form_helpers %}

{% block form %}
    <div class="panel panel-default">
        <div class="panel-heading"><strong>Device Role</strong></div>
        <div class="panel-body">
            {% render_form form %}
        </div>
    </div>
{% endblock %}