Permit specifying a name for default actions

Previously if a tour writer supplied a name along with a button action
of 'next' or 'okay', it was ignored.  Now,
	buttons: [ {
		action: 'next',
		name: 'A different name here'
	} ]
works.

Bug: 45049
Change-Id: I8667dab37eae322a07cd1997f8e2fd4d8869a532
Merge "Permit specifying a name for default actions"