Only query configWidget if there is one
Automatic merge of Transifex translations
Automatic merge of Transifex translations
Update qxt to latest upstream git revision

Now we are using plain qxt again as all needed local modifications are
merged upstream.
* Declare result_ptr as metatype.
* Added Roboto font.
* Added new AudioControls icons.
* New AudioControls design.
* Simplified QueryLabel.
* Added BackgroundWidget, a widget that can display a (blurred) background image and thoughtfully reacts to size changes.
* A styled caption-widget for use in pages, e.g. above playlists.
* Added TrackDetailView, a widget showing contextual information about a track, used e.g. next to playlists.
* Added TrackItemDelegate, to replace the various FoobarDelegates.
* Added Collection and Playlist header background images.
* Added HoverControls, a widget used when hovering an item in a GridView.
* Added ContextView, a wrapper for playlist and contextual detail view. To replace FlexibleView.
* Added HeaderWidget ui.
* Added new love icon.
* Added new widgets/ui to libtomahawk's CMakeLists.txt.
* Disable 'Trending' page until redesign is finished.