Move cn.po to zh_CN.po.

Update AUTHORS, and config.inc.proto

Signed-off-by: Loui Chang <louipc.ist@gmail.com>

AUTHORS

@@ -78,3 +78,7 @@ Samed Beyribey <ras0ir@eventualis.org>
 ----------
 sevenfourk <sevenfourk@gmail.com>
 
+简体中文
+--------
+supern_lee <supern.lee@gmail.com>
+

web/lib/config.inc.proto

@@ -31,7 +31,8 @@ $SUPPORTED_LANGS = array(
 	"pl" => "Polski",
 	"pt" => "Português",
 	"ru" => "Русский",
-	"tr" => "Türkçe"
+	"tr" => "Türkçe",
+	"zh_CN" => "简体中文"
 );
 
 # Idle seconds before timeout