I announce that I am doing french translation for the Backdrop user interface. So as nobody else do the same, it would be a loss of time. Thank you. I will report here where I am , I mean % of work done. And when finished, I will look around where I can put the file for you :)
Sate of the art : 34% done.
PS : the core, the base modules, including Token filter and Views, the Basis Theme (not the 2 others), but no more for the moment.
PS2 : can any one explain to me how to use https://localize.backdropcms.org/translate/languages/fr/translate ? Thanks