What should be the default locale: user or system locale?
If no preference was given in the
ui_last/gui_language, the current Windows version tries to find out which locale should be used on the gui using
GetUserDefaultLCID call (https://msdn.microsoft.com/en-us/library/windows/desktop/dd318135(v=vs.85).aspx).
Another option would be to use the
GetSystemDefaultLCID which is not dependent on the user's settings but on the system settings (https://msdn.microsoft.com/en-us/library/windows/desktop/dd318121(v=vs.85).aspx)
Any opinion which one should be used?