In PR #20 a new translation was added, but only the key neusta_pimcore_import_export_exclude_ids_question was added.
Could it be that the variable was not used:
let includeIds = !confirm(t('neusta_pimcore_import_export_exclude_ids_question')); // Yes = false, No = true
(source: https://github.com/teamneusta/pimcore-import-export-bundle/blob/main/public/js/exportDataObjects.js#L24)