ADR-0019 picks `@angular/localize` in build-time mode with two locales
(`fr` default, `en` source). URLs are always prefixed (`/fr/...`,
`/en/...`); `/` smart-redirects via cookie → Accept-Language → fr.
UI strings live in XLIFF; editorial content (CMS-served) is locked to
the admin-app pipeline. The locale switcher in the footer writes a
`__Host-portal_locale` cookie and hard-refreshes to the matching
bundle. The `@angular/localize` runtime mode, ngx-translate, and
transloco alternatives are recorded as considered-and-rejected.
ADR-0020 splits portal administration into a dedicated Angular SPA
(`portal-admin`) sharing the existing `portal-bff` via `/api/admin/*`
routes guarded by an Entra `admin` role plus fresh-MFA at entry. Same
identity / sessions / audit / observability primitives reused, no
infrastructure duplication. v1 ships four modules: CMS for static
multilingual pages, sidebar menu management (activating the
`requiredPermissions` field already on `MenuItem`), read-only user
list, and an audit log viewer. Bundle budget relaxed to 500 KB gzip
(vs 300 KB on `portal-shell`); same a11y + dark-mode baseline.
Together they answer the two questions raised after the footer
chantier: how the multilingual story works, and where the admin
surface lives. Implementation lands across follow-up feature PRs;
this commit is documentation only.
CLAUDE.md picks up summary entries for both decisions and bumps the
ADR coverage line to 0020.
Julien Gautier