i18n(fr): update guides/i18n.mdx

[HiDeoo]

What kind of changes does this PR include?

• Changes or translations of Starlight docs site content

Description

This pull request update the french version of the guides/i18n.mdx page with the changes of #1162.

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Latest commit: 774f34f

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Name	Status	Preview	Updated (UTC)
starlight	✅ Ready (Inspect)	Visit Preview	Dec 15, 2023 11:03pm

[dreyfus92]

ÇMSB

[delucis]

Looks good to me!

Interesting that "donné" was used in the old translation given that the i18n is technically a "data collection" rather than a content collection, but I guess we always call the feature "content collections", so the consistency makes sense 👍