private specialSearchStrings = {
    percentComplete: this.I18n.t('js.work_packages.properties.percentComplete'),
    percentCompleteAlternative: this.I18n.t('js.work_packages.properties.percentCompleteAlternative'),
    work: this.I18n.t('js.work_packages.properties.work'),
    workAlternative: this.I18n.t('js.work_packages.properties.workAlternative'),