upgrade hugo

layouts/baseof.html

@@ -1,5 +1,5 @@
 <!doctype html>
-<html lang="{{ .Site.LanguageCode }}">
+<html lang="{{ .Site.Language.Locale }}">
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />