Automatic merge of Transifex translations
* Don't delete registry keys on uninstall. We still rely on that before major version upgrades. See TWK-462.
* Catch back / forward mouse buttons to traverse through pages.
* Style fixes in TomahawkWindow.
* Only react to left-clicks in HoverControls.
* Query::numResults( onlyPlayableResults ) lets you count only online results.
* Fixed showing offline results in playlists.