Fix some incorrect German translations - translate “turn” as “Zug” instead of “Runde” - fix other wrongly translated words - fix some incorrect string IDs in de.txt - typo fixes

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}