i18n(fr): Update multiple files with EC markers

[HiDeoo]

What kind of changes does this PR include?

• Changes or translations of Starlight docs site content

Description

This PR updates the french version of the following files with the changes of #1102:

• guides/components.mdx
• guides/css-and-tailwind.mdx
• guides/customization.mdx
• guides/sidebar.mdx
• reference/frontmatter.md
• reference/overrides.md

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Latest commit: 8cb9432

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Name	Status	Preview	Updated (UTC)
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[delucis]

LGTM! 🚀

Noting that often you would be free to choose a translated filename if you wanted, e.g. exemple.md (just have to make sure it agrees between text and filename if it’s referenced in text), but will leave that choice to you.

[HiDeoo]

Noting that often you would be free to choose a translated filename if you wanted, e.g. exemple.md (just have to make sure it agrees between text and filename if it’s referenced in text), but will leave that choice to you.

Oh, this is a great idea, I never thought of that. Stealing your idea and adding it to my personal todos and I think I'll make a global pass at this in a dedicated PR 🙌