Improve escaping in code response.
BLD-1049: Allow the video player to work with redirected links.
Merge pull request #3950 from edx/anton/transcript-editor-disable-validation

Allow the video player to work with links with redirection.
Merge pull request #3981 from edx/alex/fix_matlab_check

Improve escaping in code response.
starting i18n rake --> paver
a bit more work on this
deprecating i18n tasks from rake to paver