Adds modal overlay when exercise is completed.
Adds modal popup on completion of exercise streak.
Uses sprintf for modal generation. Fixes linting.
Fixes Issue #2446 Only groups within the facility should be visible when a coach logs into a particular facility
Facility Id moved to status model
Fixes #2442
Merge pull request #2513 from anuragkanungo/css

Fixes #2442
Merge pull request #2499 from rtibbles/exercise_popup

Adds popup alert for exercise streak and overall completion.
Test moved to PlaylistAPITests
Merge pull request #2510 from anuragkanungo/nalanda-rct3

Only groups within the facility should be visible when a coach logs into a particular facility