Adding accessibility
Adding i18n gettext()
Updating note text
Merge pull request #6213 from edx/clrux/edxnotes-apply-ui

Added some accessibility that "connects" the notes with the meta information
Add a11y.
Add initial course structure view.
uncached version of notes structure
Update frontend.
Display course structure tab.
Cleanup.
Add jasmine tests.
Improve memory usage.
Update js tests.
Update helpers.
Update js tests.
Add bok-choy tests.
Add fixes.
Add python unit tests.