gimp/menus/gradients-menu.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE ui SYSTEM "gtkuimanager.dtd">

<ui>
  <popup action="gradients-menu">
    <menuitem action="gradients-edit" />
    <separator />
    <menuitem action="gradients-new" />
    <menuitem action="gradients-duplicate" />
    <menuitem action="gradients-save-as-pov" />
    <menuitem action="gradients-delete" />
    <separator />
    <menuitem action="gradients-refresh" />
  </popup>
</ui>