Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Comments fixing
1) Back out "month names" -> "months names" and fix few such cases which
are wrong initially
2) "weekdays names" -> "weekday names"

Noted by: des [1]

Comments fixing
"month names" -> "months names"
typo
"Long months names (alternative)" or "in alternative form" ->
"(without case ending)"
"Long months names" -> "Long months names (as in a date)"
to not confuse developers on what purpose those sections are

Re-generate from sl_SI.ISO8859-2.src rev. 1.8 (lowercase month/weekday names).

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.

PR: 44307