Qt: forgotten translation

(cherry picked from commit 27dd41ca)
Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

modules/gui/qt4/components/playlist/playlist.cpp

@@ -51,7 +51,7 @@ PlaylistWidget::PlaylistWidget( intf_thread_t *_p_i, QWidget *_par )
     /* Source Selector */
     selector = new PLSelector( this, p_intf );
 
-    QLabel *selLabel = new QLabel( "Media Browser" );
+    QLabel *selLabel = new QLabel( qtr( "Media Browser" ) );
     QFont font;
     font.setBold( true );
     selLabel->setFont( font );