i18n(fr): update reference/plugins & guides/i18n

[HiDeoo]

Description

This PR updates the French version of the reference/plugins and guides/i18n pages with the changes from #1923.

I did both pages in the same PR to avoid issues link issues.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9d6f9eb

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[astrobot-houston]

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Tracked Files

Locale	File	Note
fr	guides/i18n.mdx	Localization changed, will be marked as complete.
fr	reference/plugins.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]

Ready to merge — thanks @HiDeoo! 🚀

[thomasbnt]

🚀