Fixed issue with not loading default image in Firefox in study page
Fixed logo center issue in email.
Merge remote-tracking branch 'upstream/release-6.2' into release-6.2
Merge remote-tracking branch 'upstream/release-6.2' into release-6.2
Merge remote-tracking branch 'upstream/release-6.2' into release-6.2
Merge remote-tracking branch 'upstream/release-6.2' into release-6.2

* upstream/release-6.2:
  Language objective and Teacher Tip Save issues Resolved
Merge remote-tracking branch 'upstream/release-6.2' into release-6.2
Message updated.
Fixed : [Organize - Content Tab] Educational Use, Standards are not saved
Merge pull request #136 from anilgooru/release-6.2

Release 6: [Organize - Content Tab] Educational Use, Standards are not saved.