Tim J Robbins (tjr@) has committed a set of utf8-ized versions of currently supported system locales. From the commit log:

“Add UTF-8 versions of all the currently supported system locales. Most of the hard work was done by Hye-Shik Chang in the misc/utf8locale port; I made a few minor adjustments and merged the makefiles.”

It seems to be a big progress that we will finally got system messages in FreeBSD, in utf-8 rather than any national standard, this will permit processing more locales at a same time, and hence, better i18n.