i18n(fr): update media/index, nav/fr and i18n/fr

[ArmandPhilippot]

Description (required)

Adds changes from #12227 to the French translation of guides/media/index.mdx, nav/fr.ts and i18n/fr.yaml.

Related issues & labels (optional)

• Suggested label: i18n

[astrobot-houston]

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Tracked Files

File	Note
fr/guides/media/index.mdx	Localization changed, will be marked as complete.
src/content/i18n/fr.yml	Localization changed, will be marked as complete.
src/content/nav/fr.ts	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.

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[thomasbnt]

LGTM