The application menu names in XFCE is provided by the package “Garcon” ( http://wiki.xfce.org/dev/garcon ). You can directly edit the file installed by that package to change the name of the menu. In my arch linux system the files are in “/usr/share/desktop-directories” directory.
$ ls -l /usr/share/desktop-directories/
total 48
-rw-r–r– 1 root root 3306 Sep 17 07:43 xfce-accessories.directory
-rw-r–r– 1 root root 2766 Sep 17 07:43 xfce-development.directory
-rw-r–r– 1 root root 2241 Sep 17 07:43 xfce-education.directory
-rw-r–r– 1 root root 3115 Sep 17 07:43 xfce-games.directory
-rw-r–r– 1 root root 3276 Sep 17 07:43 xfce-graphics.directory
-rw-r–r– 1 root root 3210 Sep 17 07:43 xfce-multimedia.directory
-rw-r–r– 1 root root 1748 Nov 11 15:33 xfce-network.directory
-rw-r–r– 1 root root 2654 Sep 17 07:43 xfce-office.directory
-rw-r–r– 1 root root 3223 Sep 17 07:43 xfce-other.directory
-rw-r–r– 1 root root 2803 Sep 17 07:43 xfce-screensavers.directory
-rw-r–r– 1 root root 3462 Sep 17 07:43 xfce-settings.directory
-rw-r–r– 1 root root 2517 Sep 17 07:43 xfce-system.directory
total 48
-rw-r–r– 1 root root 3306 Sep 17 07:43 xfce-accessories.directory
-rw-r–r– 1 root root 2766 Sep 17 07:43 xfce-development.directory
-rw-r–r– 1 root root 2241 Sep 17 07:43 xfce-education.directory
-rw-r–r– 1 root root 3115 Sep 17 07:43 xfce-games.directory
-rw-r–r– 1 root root 3276 Sep 17 07:43 xfce-graphics.directory
-rw-r–r– 1 root root 3210 Sep 17 07:43 xfce-multimedia.directory
-rw-r–r– 1 root root 1748 Nov 11 15:33 xfce-network.directory
-rw-r–r– 1 root root 2654 Sep 17 07:43 xfce-office.directory
-rw-r–r– 1 root root 3223 Sep 17 07:43 xfce-other.directory
-rw-r–r– 1 root root 2803 Sep 17 07:43 xfce-screensavers.directory
-rw-r–r– 1 root root 3462 Sep 17 07:43 xfce-settings.directory
-rw-r–r– 1 root root 2517 Sep 17 07:43 xfce-system.directory
Change the menu name in those files and restart xfce panel.
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