silverstripe/silverstripe-multiform — pull request #19 by jkRoberts (2014-03-16 22:08:52+00:00)
Title: Custom Next and Previous Button Text

This is to allow developers to set custom button text for next and previous buttons.

All they have to do is set two variables:
public static $next_button_text = 'Custom Name'
public static $previous_button_text = 'Custom Name'

on each Multiform step.