Mention NLS option in INSTALL

Hi,

Recently I was crawling through the INSTALL
file and didn't find the --enable-nls option anywhere.
Shouldn't it be mentioned there? Somewhere like before
or after --enable-debug? Was it documented at all?
And, perhaps, this file might have some other options
missing - not a good thing!

May I propose smth like this for the forthcoming
beta if it is right place to put this in
(one might want to tweak the English, of course):

--------------------------8<-----------------------
--enable-nls

Enables Native Language Support (NLS) for error messages emitted
by the psql, libpq, pg_dump, and postgres components. Currently
supported languages are Czech (some of psql), French (some of
psql), German (psql, pg_dump, libpq, some of postgres), Russian
(psql, some of pg_dump, libpq, some of postgres), Simplified and
Traditional Chinese (all?), and Swedish (some of psql). If you
don't see your language here or no translations available for
the desired component, and you're willing to contribute, see
http://webmail.postgresql.org/~petere/nls.php for details.
--------------------------8<-----------------------

--
Serguei A. Mokhov