3rd Party Service: Update MathJax script reference.

Author: iissnan

layout/_scripts/mathjax.swig

@@ -1,24 +1,27 @@
 {% if theme.mathjax %}
-<script type="text/x-mathjax-config">
-  MathJax.Hub.Config({
-    tex2jax: {
-      inlineMath: [ ['$','$'], ["\\(","\\)"]  ],
-      processEscapes: true,
-      skipTags: ['script', 'noscript', 'style', 'textarea', 'pre', 'code']
-    }
-  });
-</script>
+  <script type="text/x-mathjax-config">
+    MathJax.Hub.Config({
+      tex2jax: {
+        inlineMath: [ ['$','$'], ["\\(","\\)"]  ],
+        processEscapes: true,
+        skipTags: ['script', 'noscript', 'style', 'textarea', 'pre', 'code']
+      }
+    });
+  </script>
 
-<script type="text/x-mathjax-config">
-  MathJax.Hub.Queue(function() {
-    var all = MathJax.Hub.getAllJax(), i;
-    for (i=0; i < all.length; i += 1) {
-      all[i].SourceElement().parentNode.className += ' has-jax';
-    }
-  });
-</script>
-
-<script type="text/javascript" src="http://cdn.staticfile.org/mathjax/2.4.0/MathJax.js"></script>
-<script type="text/javascript" src="http://cdn.staticfile.org/mathjax/2.4.0/config/TeX-AMS-MML_HTMLorMML.js"></script>
+  <script type="text/x-mathjax-config">
+    MathJax.Hub.Queue(function() {
+      var all = MathJax.Hub.getAllJax(), i;
+      for (i=0; i < all.length; i += 1) {
+        all[i].SourceElement().parentNode.className += ' has-jax';
+      }
+    });
+  </script>
 
+  {% if config.language === 'zh-Hans' %}
+    <script type="text/javascript" src="http://cdn.staticfile.org/mathjax/2.4.0/MathJax.js"></script>
+    <script type="text/javascript" src="http://cdn.staticfile.org/mathjax/2.4.0/config/TeX-AMS-MML_HTMLorMML.js"></script>
+  {% else %}
+    <script type="text/javascript" src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
+  {% endif %}
 {% endif %}