Improve front-end performance
- Gzip compresson on nginx
- Reduce js bundle size by 40% (from 1.8Mb to 1Mb, non-gzipped)
- Updated semantic UI to 2.4.1, removed our vendored CSS and disabled unused semantic UI modules
- Lazy load translations (when we change language instead than during startup)
- Lazy load markdown renderer
- removed moment.js locales (which were unused)
- Removed raven.js on front-end
- Load only used methods from lodash to reduce bundle size