For SEO reasons, it is sometimes recommended to use sub-directory for each translated language (for example: http://example.com/fr, http://example.com/it)
Bablic can handle sub-directories in the client side, but unless you configured them in the server side, your server probably will return 404 (not found error) for those page URLs.
That's why in order to set Sub-Directories option in Bablic you must first configure them in your server configuration.
Each server will have a different configuration need to be done. Please select the right guide for you: