Show publication year and media format in book details
Don't read up the cover-image of books
Add aria labels to player controls
Meaningful labels for playback rate settings
Only focus on pause/play button when its state is changed
Make loading messages role='alert'
Merge pull request #623 from saebekassebil/bookinfo

Show publication year and media format in book details
Refactor in catalog.coffee
Merge pull request #627 from saebekassebil/a11y

Fixed some a11y issues
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/models/service/catalog.coffee