default.html in just-the-docs-0.2.4

- old
+ new

@@ -1,7 +1,7 @@
 <!DOCTYPE html>
 
-<html lang="en-us">
+<html lang="{{ site.lang | default: "en-US" }}">
 {% include head.html %}
 <body>
 
   <div class="page-wrap">
     <div class="side-bar">