zulip/static/templates/settings/deactivate_realm_modal.hbs

<div id="deactivate-realm-modal" class="modal modal-bg hide fade" tabindex="-1" role="dialog" aria-labelledby="deactivate_realm_modal_label" aria-hidden="true">
    <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="{{t 'Close' }}"><span aria-hidden="true">&times;</span></button>
        <h3 id="deactivate_realm_modal_label">
            {{t "Deactivate organization" }} <span class="realm_name"></span>
            {{> ../help_link_widget link="/help/deactivate-your-organization" }}
        </h3>
    </div>
    <div class="modal-body">
        <p>{{t "This action is permanent and cannot be undone. All users will permanently lose access to their Zulip accounts." }}</p>
        <p>{{t "Are you sure you want to deactivate this organization?"}}</p>
    </div>
    <div class="modal-footer">
        <button type="button" class="button rounded" data-dismiss="modal">{{t "Cancel" }}</button>
        <button type="button" class="button rounded btn-danger" id="do_deactivate_realm_button">{{t "Confirm" }}</button>
    </div>
</div>