zulip/web/templates/profile_access_error_modal.hbs

<div class="micromodal" id="profile_access_error_modal" aria-hidden="true">
    <div class="modal__overlay" tabindex="-1">
        <div class="modal__container" role="dialog" aria-modal="true" aria-labelledby="profile_access_error_modal_label">
            <header class="modal__header">
                <h1 class="modal__title" id="profile_access_error_modal_label">
                    {{t "No user found" }}
                </h1>
                <button class="modal__close" aria-label="{{t 'Close modal' }}" data-micromodal-close></button>
            </header>
            <main class="modal__content">
                <p>
                    {{t "Either this user does not exist, or you do not have access to their profile." }}
                </p>
            </main>
            <footer class="modal__footer">
                <button type="button" class="modal__button dialog_exit_button" aria-label="{{t 'Close this dialog window' }}" data-micromodal-close>{{t "Close" }}</button>
            </footer>
        </div>
    </div>
</div>