i18n(fr): update various content layer related pages

[HiDeoo]

Description

This PR updates the French version of the following pages with the changes from #2707, #2676, and #2612 which are all Content Layer related to I decided to group them together in one PR:

• guides/i18n
• guides/project-structure
• guides/site-search
• manual-setup
• reference/frontmatter
• reference/overrides

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Latest commit: 3140128

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Tracked Files

Locale	File	Note
fr	guides/i18n.mdx	Localization changed, will be marked as complete.
fr	guides/project-structure.mdx	Localization changed, will be marked as complete.
fr	guides/site-search.mdx	Localization changed, will be marked as complete.
fr	manual-setup.mdx	Localization changed, will be marked as complete.
fr	reference/frontmatter.md	Localization changed, will be marked as complete.
fr	reference/overrides.md	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.

[delucis]

Looks great to me; I just had one query.

[delucis]

Is « l’drapeau » correct here? 👀 Never seen l’ straight into a consonant before.

[HiDeoo]

Oh, excellent catch, that's entirely a mistake, I started with le drapeau, then switched to l'option, then switched back and switched back again after checking what translators picked on Astro Docs and I messed up the articles in the process 😆