i18n/zh_CN: Improvements to firewall.po, thanks axishero
i18n/zh_CN: Improvements to firewall.po, thanks axishero

deepak78/luci,deepak78/luci,8devices/luci,8devices/luci,8devices/luci,8devices/luci,deepak78/luci,deepak78/luci,deepak78/luci,8devices/luci,deepak78/luci,8devices/luci,deepak78/luci,deepak78/luci