qt4 wording.

modules/gui/qt4/qt4.cpp

@@ -83,7 +83,7 @@ static void ShowDialog   ( intf_thread_t *, int, int, intf_dialog_args_t * );
 #define OPACITY_TEXT N_("Windows opacity between 0.1 and 1.")
 #define OPACITY_LONGTEXT N_("Sets the windows opacity between 0.1 and 1 " \
                             "for main interface, playlist and extended panel." \
-                            "This options does only work with Windows and " \
+                            "This options only works with Windows and " \
                             "X11 with composite extensions.")
 
 #define SHOWFLAGS_TEXT N_("Define what columns to show in playlist window")