nginx-proxy-manager/src/frontend/js/app/nginx/proxy/delete.ejs

<div class="modal-content">
    <div class="modal-header">
        <h5 class="modal-title"><%- i18n('proxy-hosts', 'delete') %></h5>
        <button type="button" class="close cancel" aria-label="Close" data-dismiss="modal">&nbsp;</button>
    </div>
    <div class="modal-body">
        <form>
            <div class="row">
                <div class="col-sm-12 col-md-12">
                    Are you sure you want to delete the Proxy host for: <strong><%- domain_names.join(', ') %></strong>?
                    <% if (ssl_enabled) { %>
                        <br><br>
                        The SSL certificates attached will be removed, this action cannot be recovered.
                    <% } %>
                </div>
            </div>
        </form>
    </div>
    <div class="modal-footer">
        <button type="button" class="btn btn-secondary cancel" data-dismiss="modal"><%- i18n('str', 'cancel') %></button>
        <button type="button" class="btn btn-danger save"><%- i18n('str', 'sure') %></button>
    </div>
</div>