[smichea]

Summary

• adds the playable GitHub Pages URL at the top of the main README
• translates all CPCJS documentation to English
• selects French or English from the browser locale
• adds a persistent language selector
• localizes static labels, accessibility text, runtime states, downloads, and technical errors

Validation

• 9 unit tests passed
• 5 Playwright scenarios passed
• English browser locale, French browser locale, and persisted manual selection covered
• documentation scan found no remaining French text outside the original third-party notice