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

    QTextCodec *russianCodec = QTextCodec::codecForName("UTF-8");
    QTextCodec::setCodecForTr(russianCodec);

    QTranslator qtTranslator;
    qtTranslator.load("qt_ru.qm"/* + QLocale::system().name()*/,""
                 /*QLibraryInfo::location(QLibraryInfo::TranslationsPath)*/);
         a.installTranslator(&qtTranslator);

         QTranslator myappTranslator;
         myappTranslator.load("myapp_" + QLocale::system().name());
         a.installTranslator(&myappTranslator);

    MainWindow w;
    w.resize(900, 600);
    w.show();
    return a.exec();
}

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


    QTextCodec *russianCodec = QTextCodec::codecForName("UTF-8");
    QTextCodec::setCodecForTr(russianCodec);

    QTranslator qtTranslator;
         qtTranslator.load("qt_" + QLocale::system().name(),
                 QLibraryInfo::location(QLibraryInfo::TranslationsPath));
    QApplication a(argc, argv);
         a.installTranslator(&qtTranslator);

         QTranslator myappTranslator;
         myappTranslator.load("myapp_" + QLocale::system().name());
         a.installTranslator(&myappTranslator);

    MainWindow w;
    w.resize(900, 600);
    w.show();
    return a.exec();
}

QMessageBox::StandardButton ret;
    ret = QMessageBox::warning(this, tr("Внимание"),
                 tr("Закончить рабоу ?"),
                 QMessageBox::Yes | QMessageBox::No
                 );