installTranslator returns false

[Perdrix]

Attempting to install qt_en.qm

	QString translatorFileName = QLatin1String("qt_");
	translatorFileName += language;
	qDebug() << "qt translator filename: " << translatorFileName;
	
#if QT_VERSION >= 0x060000
	qDebug() << "translationPath " << QLibraryInfo::path(QLibraryInfo::TranslationsPath);
	if (theQtTranslator.load(translatorFileName, QLibraryInfo::path(QLibraryInfo::TranslationsPath)))
#else
	qDebug() << "translationPath " << QLibraryInfo::location(QLibraryInfo::TranslationsPath);
	if (theQtTranslator.load(translatorFileName, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
#endif
	{
		bool r{ app.installTranslator(&theQtTranslator) };
		Q_ASSERT(r);
	}

app.installTranslator returned false for qt_en.qm

from the following test:

if (translationFile->isEmpty())
    return false;

do I need to special case qt_en??? Or check the file isn't empty in my own code?

David