add Korean code base. (apache#6261)

add code base code.
Thank you for allowing me to write Korean codebase.
  {
    enabled: true, 
    name: '한국어', 
    tag: 'ko-KR'},

site2/website/languages.js

@@ -179,6 +179,11 @@ const languages = [
   {
     enabled: true, 
     name: '繁體中文', 
-    tag: 'zh-TW'},
+    tag: 'zh-TW'
+  },
+  {
+    enabled: true, 
+    name: '한국어', 
+    tag: 'ko-KR'},
 ];
 module.exports = languages;