Merge pull request #2751 from anuragkanungo/nalanda-rct3

Replaced Store Views confirm box gettext with sprintf
Merge pull request #2760 from anuragkanungo/nalanda-rct3

Wait Box For Unit Switching
Include Null in video_logs query for completion_timestamp .
Merge pull request #2762 from mrpau/hotfix/2271-Export-CSV-data-quality-issues

Hotfix/2271 export csv data quality issues.
Merge pull request #2765 from learningequality/release-0.12.0

Release 0.12.0 to nalanda-rct3
Exercise Log CSV Part 1 and 2 Attempt Correct added