language switcher in menu

How can I add a language switcher to the menu?
I′m using Zanto Plugin to switch between different sites on my wp network.
The language switcher works fine in the widget area, but I can′t put a widget in the menu.
In the Zanto Plugin it says:

“
You can add a language switcher from the current Language Swicher Theme any where on your site theme by inserting any of these PHP codes in the theme: See Codes or use the language switcher widget.

drop down menu <?php do_action(?zwt_lang_switcher‘, ?drop_down‘); ?>
horizontal list <?php do_action(?zwt_lang_switcher‘, ?horizontal‘); ?>
“

Can I use this php somehow to add the language switcher to the menu?
Thanks for your help.