locale: bootstrap the simplified chinese translation

Submitted by: Liu <liuyonghui_AT_grapecity.com>

Makefile

@@ -60,7 +60,7 @@ XGETTEXT=	xgettext -L PHP --from-code=UTF-8 -F --strict --debug
 MSGFMT=		msgfmt --strict
 LOCALEDIR=	${.CURDIR}/src/share/locale
 POT=		${LOCALEDIR}/en_US/LC_MESSAGES/OPNsense.pot
-LANGS=		ja
+LANGS=		ja zh_CN
 . for LANG in ${LANGS}
 MO+=		${LOCALEDIR}/${LANG}/LC_MESSAGES/OPNsense.mo
 . endfor

src/www/system_general.php

@@ -38,6 +38,7 @@ function get_locale_list()
 
 	$locales['en_US'] = _('English');
 	$locales['ja'] = _('Japanese');
+	$locales['zh_CN'] = _('Chinese (Simplified)');
 
 	asort($locales);