Reproducer: `nx serve portal-shell` (source-locale dev server, no
`--localize`), open the home page, click the locale switcher's
"Français" entry. The switcher rewrites the URL to `/fr/` and
hard-refreshes; the Angular CLI dev server applies its SPA fallback
and serves the same source `index.html` for every path. The source
bundle boots with `<base href="/">`, the router tries to match
`/fr/` and finds no route → `NG04002: Cannot match any routes.
URL Segment: 'fr'` in the bootstrap promise rejection.
Fix: add a `{ path: '**', redirectTo: '' }` catch-all so unknown
paths bounce to home gracefully. In production this is a no-op
because each locale ships with its own `<base href="/{locale}/">`
and the locale segment is stripped before route matching — `/fr/foo`
hits the bundle's `foo` route, not the wildcard. The route also
serves as a defensive 404-to-home for any future bad URL in prod.
The locale switcher's actual limitation in dev (no per-locale
bundle, switching can only land on the source locale) stands; this
just turns the ugly error into a silent bounce so the dev iteration
is not interrupted.
Julien Gautier
0e0419ec5e