Test DateTextBox Widget

DateTextBox class, no attributes
DateTextBox class, Attributes: required="true", trim="true", constraints={min:'2004-01-01',max:'2006-12-31',formatLength:'long'}. Works for leap years
onChange:
DateTextBox class, Attributes: lang="en-us", required="true", constraints={min:'2004-01-01',max:'2006-12-31'}. Works for leap years
DateTextBox class, Attributes: lang="de-de", constraints={min:2004-01-01, max:2006-12-31}. Works for leap years