title: How can I obtain day name from QDatetime in a different language?
body: <pre><code>QDateTime date = QDateTime::currentDateTime();
  QString week = QDate::shortDayName(date.date().dayOfWeek());
  
  painter.drawText(-30, 20, 65, 40, Qt::AlignHCenter, week);
  </code></pre>
  
  <p>I'm painting a clock in Qt Creator. My Qt version is 5.8.0. The language of my system is Chinese, so the week is showed in Chinese. Is it about Locale? How can I show the week in English?</p>