Updated Italian translation
Updated Czech translation
Updated Brazilian Portuguese translation
Merged github changes

 * added css classes for cover and title in artistalbum widget in ui.
https://github.com/gnome-prototypes-team/gnome-music/issues/127

 * add to playlist button should be insensitive when there is no selection.
 https://github.com/gnome-prototypes-team/gnome-music/issues/131