Bonjour,
using the current default french dictionnary is working well. Nevertheless there is 1 case where the “learn spelling function” is not working : When the word to be learnt is starting with a Capital letter. This first letter has to be written in small block to be learnt. Then, the same word (in an another place in the text) can be learnt when starting with a Capital letter.
Hope this is clear to you,
Rgds, Marc