Do you have the language set within the .tex document itself?
/selectlanguage{French}
Or something like that. You may need to /usepackage{babel}
as well or similar. I haven't played around much with LaTeX, so not sure this will work or not--but everything I've seen indicates that the TeX document language setting is what will key the LSP language setting.
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On second thought, it looks like it probably isn't even vimtex or LSP related--probably just your vim settings. Try :set spelllang+=fr
Yes, just found out it’s not actually latex related, thought this because the spelling mistake text never showed up before, I try what you said later, thank you for your help !
Here is the solution in case someone came across this post in the future.To set the language of your LaTeX file, put :
\usepackage\[french]{babel}
and download the texlive-lang package corresponding :
sudo pacman -S texlive-lang
Glad you got it resolved! (Especially as, while I noted in my earlier reply, I don't use LaTeX currently, but I'm planning on switching over from asciidoc in the near future for reports and notes and occasionally I do need to write in French!)