Proposing French translation for the application menus

I am a French-speaking Linux and Raspberry Pi user, and I use Caprine frequently. I noticed that while the core Messenger interface is in French, the application's top menus and specific preferences remain in English.

I would love to contribute by translating these menus into French to make the app more accessible to the French community. Could you please point me to the correct file (or localization system) that needs to be modified?

Thank you for this great application!

Worldthinks