Add white and black frames on album art
Updated Hebrew translation.
Fix sensitivity prev & next buttons

Signed-off-by: Seif Lotfy <seif@lotfy.com>
Button size updates

Make sure that the next and previous buttons aren't too narrow;
ensure consistency between button heights and the rest of the theme.

https://bugzilla.gnome.org/show_bug.cgi?id=699805

Signed-off-by: Seif Lotfy <seif@lotfy.com>
Tests
Album and Artists View basic playback
tests: Correctly verify exit code when running several tests
tests: previous button is disabled when selecting first track
tests: as we're loading just one song, next button will also be disabled
tests: enable album and artist tests