Add French Langage

## Is your feature request related to a problem? Please describe.

I'm always frustrated when I use AI Playground because the interface is not available in French. As a French speaker, it makes the app harder to use and less accessible.

## Describe the solution you'd like

I would like French (Français) to be added to the list of supported languages in AI Playground, just like German, Spanish, Italian, and Japanese are already available.

## Describe alternatives you've considered

Using the app in English works, but it is not ideal for non-English speakers who want to fully enjoy the experience.

## Additional context

French is one of the most spoken languages in the world. Adding it would make AI Playground more accessible to a large community of users.