I am not the official historian of the french section . I'm far from knowing everything, but I did a little research and I didn't find a topic asking for the creation of the french sub-section.

But in the Staff section, I found a message, from June 2011, from the french mod at this time asking for new sections to be added.
So the anniversary date of the creation of the french section is somewhere in the first half of the year 2011.