Added YSubs API
Add cache to ysubs
Use YSubs API
Updated ysubs endpoint with cloudflare url
Big translation refactoring to support easier subtitles filtering
Invalidate cache after 4 hours
Merge branch '499-ysubs' into dev-0.2.8

Conflicts:
	js/frontend/models/movie.js
	js/frontend/providers/yifysubtitles.js
	js/frontend/scrapers/yts.js
	js/frontend/views/sidebar.js
	package.json
Fixed merge issue