Kolibri

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

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

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- 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

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- 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

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

- Improved documentation
- Conditional (cancelable) JS promises
- Asset bundling performance improvements
- Endpoint indexing into zip files
- Case-insensitive usernames
- Make plugins more self-contained
- Client-side router bug fixes
- Resource layer smart cache busting
- Loading 'spinner'
- Make modals accessible
- Fuzzy searching
- Usage data export
- Drive enumeration
- Content interaction logging
- I18N string extraction
- Channel switching bug fixes
- Modal popups
- A11Y updates
- Tab focus highlights
- Learn app styling changes
- User management UI
- Task management
- Content import/export
- Session state and login widget
- Channel switching
- Setup wizard plugin
- Documentation updates
- Content downloading