Document the French translation

[brettcannon]

Fixes #1959

This pull request:

• Has a title summarizes what is changing
• Includes a news entry file (remember to thank yourself!)
• Works on all actively maintained versions of Python (e.g. Python 2.7 & the latest Python 3 release)
• Works on Windows 10, macOS, and Linux (e.g. considered file system case-sensitivity)

[codecov]

Codecov Report

Merging #1998 into master will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1998      +/-   ##
==========================================
+ Coverage   74.42%   74.52%   +0.09%     
==========================================
  Files         287      287              
  Lines       13484    13484              
  Branches     2402     2402              
==========================================
+ Hits        10036    10049      +13     
+ Misses       3311     3303       -8     
+ Partials      137      132       -5

Impacted Files	Coverage Δ
src/client/debugger/mainV2.ts	77.1% <0%> (-0.81%)	⬇️
src/client/debugger/Main.ts	52.34% <0%> (+0.49%)	⬆️
src/client/debugger/PythonProcess.ts	51.25% <0%> (+5.41%)	⬆️

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