Tuto 2 and 3 translated in French

[Tititesouris]

Participates in #267
Just in time before the end of Hacktoberfest, I finished the tutorials 2 and 3. I branched out so that I could create a separate PR, let me know if there are any merging conflicts, I will happily resolve them.

[Lucas-C]

Hi @Tititesouris

Sorry, this didn't make it for hacktoberfest, I wasn't available after 6pm yesterday.

Still, good job and thank you!

Could you rebase this PR on master please, to fix the merge conflicts?

[codecov]

Codecov Report

Merging #287 (35a8194) into master (c352b82) will not change coverage.
The diff coverage is n/a.

❗ Current head 35a8194 differs from pull request most recent head 068202a. Consider uploading reports for the commit 068202a to get more accurate results

@@           Coverage Diff           @@
##           master     #287   +/-   ##
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  Coverage   87.09%   87.09%           
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  Files          16       16           
  Lines        3821     3821           
  Branches      815      815           
=======================================
  Hits         3328     3328           
  Misses        319      319           
  Partials      174      174           

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[Lucas-C]

FYI I mentioned you in this blog article 😉
https://chezsoi.org/lucas/blog/hacktoberfest-on-fpdf2.html