7
It might be part of his restaurant theme (there is lexikon.zip file there):
https://github.com/bleekk/restaurant-theme/tree/master/modules/lexikon
EDIT: I checked, and the templates are identical to the Lexikon templates that are already in the xBootstrap theme:
https://github.com/XOOPS/XoopsCore25/tree/master/htdocs/themes/xbootstrap/modules/lexikon