add lang="en" and class="notranslate" for chrome translate

[yunfei1982]

No description provided.

[NikitaIT]

This is fine, but instead of <div class="codehilite notranslate" should be <pre><code class="codehilite notranslate"
and <div class="source-file-narrow" to <code class="source-file-narrow". notranslate is just a trick, not a real spec.

I'm using this to fix it:

f = (name) => {
 [...document.querySelectorAll('.' + name)].map(x => {
 var code = document.createElement('code');
 var pre = document.createElement('pre');
 pre.appendChild(code);
 code.innerHTML = x.innerHTML;
 code.className = '' + name;
 x.replaceWith(pre);
 });
}
f('codehilite');f('source-file-narrow')