pgsql: Allow to_char() to print localized month and day names.

Log Message:
-----------
Allow to_char() to print localized month and day names.

Euler Taveira de Oliveira

Modified Files:
--------------
pgsql/doc/src/sgml:
func.sgml (r1.305 -> r1.306)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.305&r2=1.306)
pgsql/src/backend/utils/adt:
formatting.c (r1.103 -> r1.104)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/formatting.c.diff?r1=1.103&r2=1.104)