pgsql: Adjust warning message about Windows console code page to point

Log Message:
-----------
Adjust warning message about Windows console code page to point to
the right place in the docs, and gettext()ify it.

Modified Files:
--------------
pgsql/src/bin/psql:
startup.c (r1.110 -> r1.111)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/startup.c.diff?r1=1.110&r2=1.111)