WPML - The WordPress Multilingual Plugin
WPML makes it easy to create a multilingual GeoDirectory site. All that is required is the Multilingual Blog plugin.
WPML > Languages > Language URL format: select Different languages in directories (examples: mysite.com/en, mysite.com/fr etc)
If your site is only in one language, you do not need the WPML plugin.
Read more: How To Translate Or Localize GeoDirectory