Document the French translation

[Brett Cannon (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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