syncthing/gui/default/syncthing/core/networkErrorDialogView.html

<modal id="networkError" status="danger" icon="exclamation-circle" heading="{{'Connection Error' | translate}}" large="no" closeable="no">
  <div class="modal-body">
    <p translate>
      Syncthing seems to be down, or there is a problem with your Internet connection. Retrying&hellip;
    </p>
  </div>
</modal>