These docs are for an old release. Info on upgrading to version 2/3
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buttons

Defines the buttons and button-text at the top of the calendar.

This option was removed in 1.3 in favor of header and buttonText.

Boolean/Object, default: true

true will display a previous-month, next-month, and “today” button. The “today” button will only be visible for months other than the current.

false will display absolutely no buttons.

An object hash can be provided to display only certain buttons. The hash can have the following properties:

{
  today:     bool/string,
  prevYear:  bool/string,
  prevMonth: bool/string,
  nextMonth: bool/string,
  nextYear:  bool/string
}

A value of false will not display the button. A value of true will display the button with some default text. A string value will display the button and customize its text.