fix: fix lang

Author: qiwihui

_config.yml

@@ -5,6 +5,7 @@ show_downloads: false
 baseurl:  # change this to the subpath of your site, e.g. /blog. Leave it empty if you don't need it.
 url: "https://pyweekly.qiwihui.com" # change this to the base hostname & protocol for your site
 permalink: /:title
+lang: zh-cmn-Hans
 
 google_analytics: "UA-46660488-11"
 google_adsense: "ca-pub-8935595858652656"