Function getWeekdayName

getWeekdayName(weekdayIndex, shortForm?, locale?): string
Returns the name of a weekday, given a specific locale.
Parameters
- weekdayIndex: number
  The index of the weekday; Sunday is 0, Saturday is 6.
- shortForm: boolean = false
  Whether to return the short form of the weekday's name, e.g. the short form of "Monday" is "Mon".
- locale: string = undefined
  The locale in which the weekday's name should be returned.
Returns string