i18n(fr): update tutorial/*

[ArmandPhilippot]

Description (required)

Adds changes from #12012 to the French translations of the tutorial.

Note:

• I reused the label defined in i18n/fr.yml as title for consistency and for the same reasons explained in Tutorial custom page title #12012 (comment)
• I haven't replaced Docs with Documentation because all the auto-generated titles use Docs, so consistency again.

Related issues & labels (optional)

• Suggested label: i18n

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Tracked Files

File	Note
fr/tutorial/0-introduction/index.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/index.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/index.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/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.

[thomasbnt]

LGTM!