Fix zh-Hans' Chinese word & Beautify code (#311)

"中文" means both "zh-Hans" and "zh-Hant"
"简体中文" means "zh-Hans"
"繁體中文" means "zh-Hant"

References:
- [What's New in Globalization and Localization - msdn.microsoft.com](https://msdn.microsoft.com/en-us/library/dd997383(v=vs.100).aspx#new_specific_cultures)
- [zh-cn 与 zh-hans 是什么关系、有什么区别？ - zhihu.com](https://www.zhihu.com/question/21980689)

website/languages.js

@@ -173,7 +173,7 @@ const languages = [
   },
   {
     enabled: false,
-    name: "中文",
+    name: "简体中文",
     tag: "zh-Hans"
   },
   {