i18n(fr): update reference/overrides & guides/sidebar

[HiDeoo]

Description

This PR updates the French version of the reference/overrides & guides/sidebar with the changes from #2390.

Links validation should pass once #2885 is merged and this PR updated.

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Tracked Files

Locale	File	Note
fr	guides/sidebar.mdx	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.

[trueberryless]

LGTM 🎉

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