[PyQt] Bug report: The calendarwidget.py example is broken in PyQt5

[Russell Warren]

It uses QLocale.countriesForLanguage, which is now obsolete [1].  It needs
to be adapted for QLocale::​matchingLocales.

$ ./calendarwidget.py
Traceback (most recent call last):
  File "./calendarwidget.py", line 414, in <module>
    window = Window()
  File "./calendarwidget.py", line 58, in __init__
    self.createGeneralOptionsGroupBox()
  File "./calendarwidget.py", line 191, in createGeneralOptionsGroupBox
    countries = QLocale.countriesForLanguage(lang)
AttributeError: type object 'QLocale' has no attribute
'countriesForLanguage'

[1]: http://doc.qt.io/qt-5/qlocale-obsolete.html
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