Add Manifest Localization aka. `*_localized` members

- https://mastodon.social/@intenttoship.dev@bsky.brid.gy/116167775151265490
- https://groups.google.com/a/chromium.org/g/blink-dev/c/C3UvLtvVTjA/m/nrAAfIUnAgAJ
- https://www.w3.org/TR/appmanifest/#x_localized-members