i18n(fr): add guides/actions.mdx

[ArmandPhilippot]

Description (required)

• Translate the Actions guide added in 4.15.0 Minor release docs #9224 and add nav item
• Apply changes from Fix Actions version and API reference verbage #9254 and actions.mdx: fix small typo #9259

Related issues & labels (optional)

• Suggested label: i18n

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Tracked Files

Locale	File	Note
fr	guides/actions.mdx	Localization added, will be marked as complete.
fr	reference/api-reference.mdx	Localization changed, will be marked as complete.
fr	nav.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.

[pioupia]

LGTM!

[yanthomasdev]

LGTM! Amazing work! 🚀