Merge pull request #87 from skim-ks/gacco2/master

fixed bugs on EDX-396
UI UPDATE 2014_06_10 AM
Merge pull request #88 from WatanabeYasumasa/gacco2/master

UI UPDATE 2014_06_10 AM
Fix untranslated messages
Merge pull request #89 from yokose-ks/gacco2/master

Fix untranslated messages
Update po/mo files
Merge branch 'gacco2/master' of https://github.com/nttks/edx-platform into gacco2/master
Merge pull request #90 from skim-ks/gacco2/master

fixed rest of EDX-396
Merge branch 'gacco2/master' of https://github.com/nttks/edx-platform into gacco2/master
bugfix around discussion (#comments, alert-modal)