Add IMDB rating to movie items in the movie browser

Conflicts:
	src/app/styl/movie_detail.styl
	src/app/styl/show_detail.styl
Remove global rating styles
Fix rating value formula
Improve the look of the items cover rating
Make the rating on the covers an option
Fix cover rating stars font size
Add French translation for the covers rating setting
Fix settings UI section height
Merge branch 'master' into feature/poster-imdb-rating

Conflicts:
	src/app/language/en.json
Merge pull request #1036 from andrefgneves/feature/poster-imdb-rating

Add IMDB rating to movie items in the movie browser