i18n(fr): improve the wording and fix some things in tutorial

[ArmandPhilippot]

Description (required)

Updates the French translation of tutorial to:

• Add changes from [tutorial] consistent voice #4700 (yeah, it's old...)
• In the same way as above, use infinitive form for headings instead of imperative (this is what we use in other pages... and usually, it's better to use the infinitive form for headings)
• Fix grammar in <PreCheck> (after Préparez-vous à… we should use infintive and not imperative)
• Fix some CSS classes (check-list/puzzle-piece)
• Fix some bad translations (balise instead of étiquette)
• Reword some sentences to make the reading easier
• Add some non breaking spaces to avoid punctuation being on a new line in some places...
• Fix some VS Code translation (I installed the French module to check)
• Replace taper with écrire or saisir (I mean, taper seems more like "everyday language" than something to write)
• Replace stocker with sauvegarder in some places... same, I think we have better words to describe the action
• Fix inconsistent translations between units (e.g. échecs/obstacles) or missing translation while translated before (e.g. Écrit par/Written by)
• Translate the text in sharing buttons
• Replace the translation of Check in: Unit X
• Bring changes following i18n(fr): update the French i18n-guide #11593:
  • replace île with îlot
  • replace construire (in some places) with créer or compiler
  • replace support with prise en charge (maybe something we should add to the i18n guide? I mean support is more an anglicism)
  • replace styliser with mettre en forme
  • add language after resources
  • use French quotes (guillemets) instead of double quotes

I left some comments to explain my choices in some places, feel free to give your opinion there!

Related issues & labels (optional)

• Suggested label: i18n

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Tracked Files

File	Note
fr/tutorial/0-introduction/1.mdx	Localization changed, will be marked as complete.
fr/tutorial/0-introduction/index.mdx	Localization changed, will be marked as complete.
fr/tutorial/1-setup/1.mdx	Localization changed, will be marked as complete.
fr/tutorial/1-setup/2.mdx	Localization changed, will be marked as complete.
fr/tutorial/1-setup/3.mdx	Localization changed, will be marked as complete.
fr/tutorial/1-setup/4.mdx	Localization changed, will be marked as complete.
fr/tutorial/1-setup/5.mdx	Localization changed, will be marked as complete.
fr/tutorial/1-setup/index.mdx	Localization changed, will be marked as complete.
fr/tutorial/2-pages/1.mdx	Localization changed, will be marked as complete.
fr/tutorial/2-pages/2.mdx	Localization changed, will be marked as complete.
fr/tutorial/2-pages/3.mdx	Localization changed, will be marked as complete.
fr/tutorial/2-pages/4.mdx	Localization changed, will be marked as complete.
fr/tutorial/2-pages/5.mdx	Localization changed, will be marked as complete.
fr/tutorial/2-pages/index.mdx	Localization changed, will be marked as complete.
fr/tutorial/3-components/1.mdx	Localization changed, will be marked as complete.
fr/tutorial/3-components/2.mdx	Localization changed, will be marked as complete.
fr/tutorial/3-components/3.mdx	Localization changed, will be marked as complete.
fr/tutorial/3-components/4.mdx	Localization changed, will be marked as complete.
fr/tutorial/3-components/index.mdx	Localization changed, will be marked as complete.
fr/tutorial/4-layouts/1.mdx	Localization changed, will be marked as complete.
fr/tutorial/4-layouts/2.mdx	Localization changed, will be marked as complete.
fr/tutorial/4-layouts/3.mdx	Localization changed, will be marked as complete.
fr/tutorial/4-layouts/index.mdx	Localization changed, will be marked as complete.
fr/tutorial/5-astro-api/1.mdx	Localization changed, will be marked as complete.
fr/tutorial/5-astro-api/2.mdx	Localization changed, will be marked as complete.
fr/tutorial/5-astro-api/3.mdx	Localization changed, will be marked as complete.
fr/tutorial/5-astro-api/4.mdx	Localization changed, will be marked as complete.
fr/tutorial/5-astro-api/index.mdx	Localization changed, will be marked as complete.
fr/tutorial/6-islands/1.mdx	Localization changed, will be marked as complete.
fr/tutorial/6-islands/2.mdx	Localization changed, will be marked as complete.
fr/tutorial/6-islands/3.mdx	Localization changed, will be marked as complete.
fr/tutorial/6-islands/4.mdx	Localization changed, will be marked as complete.
fr/tutorial/6-islands/index.mdx	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[ArmandPhilippot]

This is to comply with #4700 but I'm not entirely satisfied with this translation... so if you have ideas, they are welcome!

[thomasbnt]

LGTM for the rest of files!