Bring previous and next icons into XDG compliance

diff --git a/bibletime/util/cresmgr.cpp b/bibletime/util/cresmgr.cpp
index 0b848db..79828ac 100644
--- a/bibletime/util/cresmgr.cpp
+++ b/bibletime/util/cresmgr.cpp
@@ -387,14 +387,14 @@
 			namespace backInHistory {
 				TQString tooltip;
 
-				const TQString icon        = "previous";
+				const TQString icon        = "go-previous";
 				const TDEShortcut accel     = TQt::ALT + TQt::Key_Left;
 				const char* actionName    = "window_history_back_action";
 			}
 			namespace forwardInHistory {
 				TQString tooltip;
 
-				const TQString icon        = "next";
+				const TQString icon        = "go-next";
 				const TDEShortcut accel     = TQt::ALT + TQt::Key_Right;
 				const char* actionName    = "window_history_forward_action";
 			}