import subtitles into studio: add python side functionality
import subtitles into studio: add python integration tests
import subtitles into studio: add python unit tests for utils functions
Added button in Studio editor for Subtitles interface.
Add styles for buttons
Rework of adding button to Studio edit dialog. Now general to any xmodule.
Work in progress.
Change tabs logic
Temp: add templates and View
TEMP: Add id and interactions
Add popups