Added CJK support + MathJax display

app/data.yml

@@ -53,6 +53,8 @@ defaults:
       signature:
         name: Wiki
         email: wiki@example.com
+    features:
+      mathjax: true
     externalLogging:
       bugsnap: false
       loggly: false

app/regex.js

@@ -0,0 +1,9 @@
+'use strict'
+
+module.exports = {
+  arabic: /([\u0600-\u06ff]|[\u0750-\u077f]|[\ufb50-\ufc3f]|[\ufe70-\ufefc])/,
+  cjk: /([\u4E00-\u9FBF]|[\u3040-\u309F\u30A0-\u30FF]|[ㄱ-ㅎ가-힣ㅏ-ㅣ])/,
+  youtube: /(?:(?:youtu\.be\/|v\/|vi\/|u\/\w\/|embed\/)|(?:(?:watch)?\?v(?:i)?=|&v(?:i)?=))([^#&?]*).*/,
+  vimeo: /vimeo.com\/(?:channels\/(?:\w+\/)?|groups\/(?:[^/]*)\/videos\/|album\/(?:\d+)\/video\/|)(\d+)(?:$|\/|\?)/,
+  dailymotion: /(?:dailymotion\.com(?:\/embed)?(?:\/video|\/hub)|dai\.ly)\/([0-9a-z]+)(?:[-_0-9a-zA-Z]+(?:#video=)?([a-z0-9]+)?)?/
+}