#include <QApplication>
#include <QLibraryInfo>
#include <QMainWindow>
#include <QStyle>
#include <QToolBar>
#include <QTranslator>

int main(int argc, char *argv[])
{

    QApplication a(argc, argv);

    QTranslator translator;
    translator.load("qt_fa", QLibraryInfo::location(QLibraryInfo::TranslationsPath));
    a.installTranslator(&translator);

    // a workaround to fix issue
    //a.setLayoutDirection(QApplication::tr("QT_LAYOUT_DIRECTION") == QLatin1String("RTL") ? Qt::RightToLeft : Qt::LeftToRight);

    QMainWindow w;
    QToolBar toolbar;
    toolbar.setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
    toolbar.addAction(toolbar.style()->standardIcon(QStyle::SP_ArrowBack), "QT_LAYOUT_DIRECTION");
    toolbar.addAction(toolbar.style()->standardIcon(QStyle::SP_ArrowUp), "has been translated to");
    toolbar.addAction(toolbar.style()->standardIcon(QStyle::SP_ArrowForward), QApplication::tr("QT_LAYOUT_DIRECTION"));

    w.addToolBar(&toolbar);

    w.resize(600, 300);
    w.show();

    return a.exec();
}