Kolibri

-----

- Turns video captions on by default

-----

- Updated translations for Portuguese and Kiswahili in exercises.
- Updated Spanish translations

-----

- Portuguese and Kaswihili updates
- Windows fixes (mimetypes and modified time)
- VF sidebar translations

-----

- Add support for nested URL structures in API Resource layer
- Add Spanish and Swahili translations
- Improve pipeline for translating plugins
- Add search back in
- Content Renderers use explicit new API rather than event-based loading

-----

- Add authentication for tasks API
- Temporarily remove 'search' functionality
- Rename 'Learn/Explore' to 'Recommended/Topics'
- Add JS-based 'responsive mixin' as alternative to media queries
- Replace jeet grids with pure.css grids
- Begin using some keen-ui components
- Update primary layout and navigation
- New log-in page
- User sign-up and profile-editing functionality
- Versioning based on git tags
- Client heartbeat for usage tracking
- Allow plugins to override core components
- Wrap all user-facing strings for I18N
- Log filtering based on users and collections
- Improved docs
- Pin dependencies with Yarn
- ES2015 transpilation now Bublé instead of Babel
- Webpack build process compatible with plugins outside the kolibri directory
- Vue2 refactor
- HTML5 app renderer

-----

- SVG inlining
- Exercise completion visualization
- Perseus exercise renderer
- Coach reports