Update French translation default.po

[pquattro]

Fix missing translations

[JakobLichterfeld]

Thanks for your change. Please open a new PR with current target branch main

[brianmay]

I think you mean the master branch here, we don't currently have a main branch.

(I wouldn't be against changing this, but topic for discussion somewhere else)

[pquattro]

@brianmay true, ask a merge on master was not natural for me. But it work :). Thanks for your works guys.

[JakobLichterfeld]

I think you mean the master branch here, we don't currently have a main branch.

Yeah, thanks for correcting

(I wouldn't be against changing this, but topic for discussion somewhere else)

--> #3503