Sumanth V Rao ca7f84ac58 markdown: bugfix: Fix importing pygments data for codeblock header creation. ...

In c563cdba61 we imported the generated
pygments data from outside `/shared` folder. This had a couple of
problems:
    * Using `require` was the wrong way to do the import in ES6 modules.
    * Since we get the data from outside `/shared`, clients like
      zulip-mobile would not receive it - this case had to be handeled.

Here, we fix the above problems by receiving the data when initializing
through fenced_code.initialize, and when the pygments data structure is
empty (for zulip-mobile) we fallback to the old header structure without
the data-code-language tag.

Also, this commit does a small refactor to improve the way we fetch
canonicalized_alias from pygments_data.

Tests amended.

2020-09-28 15:39:31 -07:00

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