Updated tests for online help

cms/djangoapps/contentstore/context_processors.py

cms/djangoapps/contentstore/features/course-export.py

cms/djangoapps/contentstore/features/course_import.py

cms/djangoapps/contentstore/features/help.feature

cms/djangoapps/contentstore/features/help.py

cms/templates/base.html

cms/templates/index.html

cms/templates/textbooks.html

cms/templates/widgets/header.html

cms/templates/widgets/sock.html