Update jquery.i18n to 255b10492507f78acd547cfab71eef403018d76f

From https://github.com/wikimedia/jquery.i18n/tree/255b10492507f78acd547cfab71eef403018d76f

Change-Id: I77398f35c9f5465ba6fd224f35b6a863269a7d38
Merge "Update jquery.i18n to 255b10492507f78acd547cfab71eef403018d76f"