Affects Version/s: None
Fix Version/s: None
DateField uses the unexpected first day of the week.
Currently DateField expects that Calendar#getFirstDayOfWeek()
returns SUNDAY = 0, MONDAY = 1.
But actually Calendar#getFirstDayOfWeek() returns SUNDAY = 1, MONDAY = 2.
Therefore, the first day of the week becomes the one different from
the convention of each country.