make embargo template theme-able

Use "Stanford-style" theming to enable you to put your own embargo
notice up.
missing themed embargo page fails safely to unthemed
updated pdf viewer
Added ENABLE_MKTG_SITE to Features
Added myself to author file
remove course location from loc_mapper on delete
Remove duplicate code in transcripts_ajax.
fix typo in data download tab (LMS-2441)
More helpful UX in beta membership widget

LMS-2262
Add Malaysian, Catalan languages
Update translations (autogenerated message)
Moved all YouTube related URLs to a separate namespace.

All YouTube urls are defined on backend side.
Merge pull request #3039 from edx/valera/separate_youtube_urls

Moved all YouTube related URLs to a separate namespace.
Merge pull request #3036 from edx/sarina/032414-language-update

032414 Language update
Merge pull request #3028 from edx/sarina/LMS-2262

More helpful UX in beta membership widget
Fixes BLD-948 by escaping messages from xqueue, preventing malformed
html from getting onto the page. The client will then unescape the html
and display it.
Merge pull request #3025 from edx/dcs/fix-matlab-response

Fixes BLD-948 by escaping messages from xqueue, preventing malformed
Merge pull request #3041 from edx/adam/fix-data-download

fix typo in data download tab (LMS-2441)
Added image tags to the whitelist for matlab
Clean up references to answer distribution-like things

In the near future an answer distribution report will be displayed in the data download reports table.  In order to avoid confusion, we need to clean up several misleading labels and remove a redundant feature.

Note that the redundant feature is surrounded by a feature flag so that it can be disabled once the report goes live in the table.

Fixes: AN-694