Merge pull request #101 from skim-ks/gacco2/master

Gacco2/master
Truly Fix on STUDY MENU in Smartphone view.
EDX-400: Fix bug of confirm prompt
Merge pull request #102 from WatanabeYasumasa/gacco2/master

Truly Fix on STUDY MENU in Smartphone view.
Merge pull request #103 from yokose-ks/gacco2/master

EDX-400: Fix bug of confirm prompt
Update help_modal.html
Merge pull request #104 from WatanabeYasumasa/gacco2/master

Update help_modal.html
bugfix (temporary)