router - Demo routing localized app paths

[huntharo]

To-Do

• Update edge-to-origin to allow a list of locale prefix directories
• router-lib - Strip the locale prefix before looking up the appname and version
• router-lib - Strip the locale prefix on /_next/data/0.7.0/en/nextjs-demo/posts/ssg-ssr.json?id=ssg-ssr
• Add a CloudFront behavior for /sv/ manually to start testing
• Update CDK constructs to create either * locale route or list of locale routes
• Add/update tests as necessary
• Manually test the nextjs-demo app with localization

Notes

• This is not the same as the prefix functionality
  • prefix applies to everything: static files, api routes, _next/data, pages, everything
  • locales only apply to page paths
• Example paths with locales for app without basePath set
  • Page: /sv/nextjs-demo
  • _next/data: /_next/data/development/sv/nextjs-demo/post
  • Images: /nextjs-demo/0.0.0/images/profile.jpg
  • Manifest: /nextjs-demo/0.0.0/_next/static/development/_buildManifest.js
  • Page JS Chunk: /nextjs-demo/0.0.0/_next/static/chunks/pages/nextjs-demo/posts/%5Bid%5D.js
• CloudFront Behavior Implications:
  • Only 1 new /*/[something] route needs to be added for Pages