Ahh, I am going crazy! First I thought the same, wysota, but before replying I had a quick look at the i18n example of the docs where they have the function
Qt Code: 
  1. void LanguageChooser::checkBoxToggled()
  2.  {
  3.      QCheckBox *checkBox = qobject_cast<QCheckBox *>(sender());
  4.      MainWindow *window = mainWindowForCheckBoxMap[checkBox];
  5.      if (!window) {
  6.          QTranslator translator;
  7.          translator.load(qmFileForCheckBoxMap[checkBox]);
  8.          qApp->installTranslator(&translator);
  9.  
  10.          window = new MainWindow;
  11.          window->setPalette(colorForLanguage(checkBox->text()));
  12.  
  13.          window->installEventFilter(this);
  14.          mainWindowForCheckBoxMap.insert(checkBox, window);
  15.      }
  16.      window->setVisible(checkBox->isChecked());
  17.  }
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and thought (puzzled) that it would be possible. Now after having a closer look I understand the documentations code full and it isn't possible. Off course! Sometimes the examples are very trappy.

Edit: Nice question style with the /* ??? */ comment and you haven't forgot to place it inside the code