i18n: Fixes in Qt4 tooltips.

Remeber that N_( DEFINE ) is not enough

Spotted-by: Cristian Secară
(cherry picked from commit 643c8411)
Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

modules/gui/qt4/components/interface_widgets.cpp

@@ -850,13 +850,13 @@ void ControlsWidget::setNavigation( int navigation )
     {
         discFrame->hide();
     } else if( navigation == 1 ) {
-        prevSectionButton->setToolTip( qfu( HELP_PCH ) );
-        nextSectionButton->setToolTip( qfu( HELP_NCH ) );
+        prevSectionButton->setToolTip( qtr( HELP_PCH ) );
+        nextSectionButton->setToolTip( qtr( HELP_NCH ) );
         menuButton->show();
         discFrame->show();
     } else {
-        prevSectionButton->setToolTip( qfu( HELP_PCH ) );
-        nextSectionButton->setToolTip( qfu( HELP_NCH ) );
+        prevSectionButton->setToolTip( qtr( HELP_PCH ) );
+        nextSectionButton->setToolTip( qtr( HELP_NCH ) );
         menuButton->hide();
         discFrame->show();
     }

modules/gui/qt4/components/open_panels.cpp

@@ -232,7 +232,7 @@ DiscOpenPanel::DiscOpenPanel( QWidget *_parent, intf_thread_t *_p_intf ) :
     b_firstvcd = true;
     b_firstcdda = true;
 
-    ui.browseDiscButton->setToolTip( I_DEVICE_TOOLTIP );
+    ui.browseDiscButton->setToolTip( qtr( I_DEVICE_TOOLTIP ));
     ui.deviceCombo->setToolTip( I_DEVICE_TOOLTIP );
 
 #if WIN32 /* Disc drives probing for Windows */