i18n(fr): update modules/astro-assets & image-service-reference

[ArmandPhilippot]

Description (required)

Adds changes from #12867 to the French translations of reference/modules/astro-assets.mdx and reference/image-service-reference.mdx (+ updates related links in other files).

Related issues & labels (optional)

• Suggested label: i18n

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Tracked Files

File	Note
fr/guides/images.mdx	Localization changed, will be marked as complete.
fr/guides/migrate-to-astro/from-gatsby.mdx	Localization changed, will be marked as complete.
fr/guides/migrate-to-astro/from-nextjs.mdx	Localization changed, will be marked as complete.
fr/guides/migrate-to-astro/from-nuxtjs.mdx	Localization changed, will be marked as complete.
fr/guides/upgrade-to/v3.mdx	Localization changed, will be marked as complete.
fr/reference/image-service-reference.mdx	Localization changed, will be marked as complete.
fr/reference/modules/astro-assets.mdx	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.

[thomasbnt]

Only one space, the rest if LGTM!

[thomasbnt]

LGTM!