[French] e-book -> livre numérique – Update Business Case

[remibetin]

Integrates https://github.com/w3c/wai-bcase/pull/136 from @3l3gant-cod3s

Direct link to preview: https://deploy-preview-497--wai-website.netlify.app/business-case/fr

[netlify[bot]]

✅ Deploy Preview for wai-website ready!

Name	Link
🔨 Latest commit	5fc3434172be0afcd90a3eaded0484d09026d92a
🔍 Latest deploy log	https://app.netlify.com/sites/wai-website/deploys/66670094ad06dd00087a6484
😎 Deploy Preview	https://deploy-preview-497--wai-website.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 99 (no change from production) Accessibility: 100 (no change from production) Best Practices: 92 (no change from production) SEO: 100 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[remibetin]

Thanks @3l3gant-cod3s the translation has been updated: https://www.w3.org/WAI/business-case/fr