Improve some french translations

[xavierfacq]

Description of change

Improve the initial French translation on the homepage 🇫🇷

Checklist

• npm test passes

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[codecov]

Codecov Report

Merging #2206 (7e8723e) into main (3c39d15) will increase coverage by 0.00%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2206   +/-   ##
=======================================
  Coverage   99.19%   99.20%           
=======================================
  Files          87       87           
  Lines        6467     6504   +37     
  Branches      550      554    +4     
=======================================
+ Hits         6415     6452   +37     
  Misses         52       52           

see 1 file with indirect coverage changes

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