Bring previous and next icons into XDG compliance

diff --git a/src/mergeelements.cpp b/src/mergeelements.cpp
index c996a17..b765d01 100644
--- a/src/mergeelements.cpp
+++ b/src/mergeelements.cpp
@@ -121,7 +121,7 @@
     }
 
     MergeElements::MergeElements( TQWidget *parent )
-            : KDialogBase( parent, "MergeElements", true, "undefined", Ok | Cancel | User1 | User2, User1, true, KGuiItem( i18n( "Next" ), "next" ), KGuiItem( i18n( "Previous" ), "previous" ) ), m_currentCliqueIndex( 0 )
+            : KDialogBase( parent, "MergeElements", true, "undefined", Ok | Cancel | User1 | User2, User1, true, KGuiItem( i18n( "Next" ), "go-next" ), KGuiItem( i18n( "Previous" ), "go-previous" ) ), m_currentCliqueIndex( 0 )
     {
         setupGUI();
     }