Improve French translation

[merwok]

• fix number units translations
• use proper decimal separator

[merwok]

In my own projects, I tend to save filenames but not line numbers to PO files, to avoid such diff churn.
What do you think of changing the update script in another PR?

[hugovk]

I don't make translations myself, so if they're not useful I'll take your word for it and a PR is welcome :)

[merwok]

Either the line numbers get outdated, so they are useless and get ignored, or they create churn in the history (which I could just accept but…)

So personally I find the filenames useful to be able to look up the context (source strings and even context lines from pgettext are not always enough), I tend to dislike the line numbers.

But you could open a ticket and ping translators to see their experience!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.49%. Comparing base (09d081f) to head (4167864).
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #248   +/-   ##
=======================================
  Coverage   99.49%   99.49%           
=======================================
  Files          11       11           
  Lines         796      798    +2     
=======================================
+ Hits          792      794    +2     
  Misses          4        4           

Flag	Coverage Δ
macos-latest	97.74% <100.00%> (+<0.01%)	⬆️
ubuntu-latest	97.74% <100.00%> (+<0.01%)	⬆️
windows-latest	95.73% <0.00%> (-0.25%)	⬇️

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[hugovk]

Merci beaucoup !