Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

. add comment that 4 character of int_curr_symbol should be SPACE
. fix chinese locales to meet this requirement

Add uk_UA

Submitted by: Alexander Matey <matey@cis.ohio-state.edu>