netbox-community-netbox/netbox/templates/dcim/inc/cable_toggle_buttons.html

{% if perms.dcim.change_cable %}
    {% if cable.status == 'connected' %}
        <button type="button" class="btn btn-warning btn-sm cable-toggle connected" title="Mark Planned" data="{{ cable.pk }}">
            <i class="mdi mdi-lan-disconnect" aria-hidden="true"></i>
        </button>
    {% else %}
        <button type="button" class="btn btn-info btn-sm cable-toggle" title="Mark Installed" data="{{ cable.pk }}">
            <i class="mdi mdi-lan-connect" aria-hidden="true"></i>
        </button>
    {% endif %}
{% endif %}