According to google group's discussion on https://groups.google.com/d/topic/liftweb/MvVYpNbjcDw/discussion
Denis: I am wondered, why lift has both ? and ?? methods. IMHO, more useful and flexible will be to have one method that uses core text resources on bottom. So anybody can override it with own resources and can easily use core strings in his app.
David: I agree with this. Please open a ticket and I'll work through the code and get rid of S.??
Imported from Assembla: http://www.assembla.com/spaces/liftweb/tickets/1106
see #1233 which I think is the same
This is the same as #1233