Updated Norwegian bokmål translation.
Added Swedish translation
Updated Slovenian translation
Updated Hungarian translation
Updated Chinese (Taiwan) translation
songs: make sure we remember the populate state for songs view
artists: activate All Artists after the loading has begun to avoid duplicated load
playlists: don't request track title twice
album widget: remember the pixbuf
artist album widget: don't update selection mode unless required
search: return to search results when Back pressed
artists: fix pep8 error
widgets: remove remains of Gio-based file monitors