diff --git a/README.md b/README.md
index a338db3..527aa08 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ El sistema está construido como un **monolito modular** con límites de dominio
 Discovery → Lead → Opportunity → Quote → Order → Inventory → Portal → Invoice → Payment
 ```
 
-**928 tests** (contrato + integración + e2e) en 48 archivos. Dashboard con datos reales (facturación, pipeline CRM, operaciones).
+**932 tests** (contrato + integración + e2e) en 48 archivos. Dashboard con datos reales (facturación, pipeline CRM, operaciones).
 
 ---
 
@@ -106,7 +106,7 @@ cbos-platform/
 │   │   │   ├── accounting/         Facturación, pagos, overdue scanner
 │   │   │   └── analytics/          Agregación cross-módulo
 │   │   └── main.py                 Lifespan, routers, CORS, background tasks
-│   ├── tests/                      928 tests (pytest-asyncio)
+│   ├── tests/                      932 tests (pytest-asyncio)
 │   ├── alembic/                    Migraciones de base de datos
 │   └── requirements.txt
 ├── composable-os/                  React 18 + Vite frontend
@@ -232,7 +232,7 @@ docker compose exec backend pytest --tb=short -q
 cd backend && pytest --tb=short -q
 ```
 
-**928 tests** en 48 archivos. Las categorías no se solapan: cada archivo cuenta
+**932 tests** en 48 archivos. Las categorías no se solapan: cada archivo cuenta
 una sola vez y las filas suman 41.
 
 | Categoría | Archivos | Cobertura |
diff --git a/backend/app/core/i18n/__init__.py b/backend/app/core/i18n/__init__.py
index 571b773..2843ad2 100644
--- a/backend/app/core/i18n/__init__.py
+++ b/backend/app/core/i18n/__init__.py
@@ -27,17 +27,16 @@
 
 # Idiomas que el producto ofrece: lo que acepta el PATCH del locale propio, lo
 # que lee `Accept-Language` al registrarse y lo que resuelve `resolve_locale`.
-SUPPORTED_LOCALES: tuple[str, ...] = ("es",)
-
-# Idiomas con catalogo en el repo que aun no se ofrecen (tarea 12 del plan de i18n).
-# Un idioma se ofrece cuando esta completo en las *dos* capas: el servidor
-# (`locales/<idioma>/`, aqui) y la interfaz (`composable-os/src/locales`). Con
-# solo el servidor listo, un usuario con el navegador en ingles se registraria con
-# `en` y recibiria el PDF y los correos en ingles con la interfaz en espanol.
-# `translate("...", "en")` ya funciona (los tests lo ejercitan); lo que no hace
-# todavia es que nadie llegue a `en` solo. Pasar un idioma de aqui a
-# `SUPPORTED_LOCALES` es el ultimo paso de la tarea 12.
-UNRELEASED_LOCALES: tuple[str, ...] = ("en",)
+SUPPORTED_LOCALES: tuple[str, ...] = ("es", "en")
+
+# Idiomas con catalogo en el repo que aun no se ofrecen. Hoy ninguno: `en` paso a
+# `SUPPORTED_LOCALES` en el ultimo paso de la tarea 12, cuando estuvo completo en las
+# *dos* capas, el servidor (`locales/<idioma>/`, aqui) y la interfaz
+# (`composable-os/src/locales`). Con solo una de las dos listas, un usuario con el
+# navegador en ese idioma se registraria con el y recibiria el PDF y los correos en un
+# idioma que la interfaz no habla, o al reves. Un idioma nuevo vuelve a entrar aqui
+# mientras se traduce y sale cuando esta completo en las dos capas.
+UNRELEASED_LOCALES: tuple[str, ...] = ()
 
 DEFAULT_LOCALE = "es"
 
diff --git a/backend/tests/test_english_artifacts.py b/backend/tests/test_english_artifacts.py
index aa69e56..27c451b 100644
--- a/backend/tests/test_english_artifacts.py
+++ b/backend/tests/test_english_artifacts.py
@@ -15,9 +15,10 @@
   palabras menos las del `en`) no aparece en lo que sale en `en`. Un texto que se
   quedo en espanol tiene palabras que ningun catalogo ingles contiene.
 
-Lo que NO cubre: fechas e importes siguen sin seguir al idioma (ver tarea 10), y el
-idioma no se ofrece aun a nadie (`UNRELEASED_LOCALES`): se llega a el pasando
-`locale="en"` directamente.
+Lo que NO cubre: fechas e importes siguen sin seguir al idioma (ver tarea 10). El
+idioma ya se ofrece (`SUPPORTED_LOCALES`), pero estos tests pasan `locale="en"` a
+mano: no ejercitan la cadena de resolucion, que cubren `test_locale.py` y
+`test_locale_resolution.py`.
 """
 import re
 
diff --git a/backend/tests/test_i18n_catalogue.py b/backend/tests/test_i18n_catalogue.py
index ece53c3..aedf1c0 100644
--- a/backend/tests/test_i18n_catalogue.py
+++ b/backend/tests/test_i18n_catalogue.py
@@ -68,14 +68,26 @@ async def test_a_language_is_either_offered_or_unreleased_not_both():
     assert not set(SUPPORTED_LOCALES) & set(UNRELEASED_LOCALES)
 
 
-async def test_an_unreleased_language_is_not_reachable_on_its_own():
-    # Tiene catalogo y `translate` lo sirve, pero nadie llega a el solo: ni por el
-    # PATCH del locale, ni por `Accept-Language`, ni por el workspace.
-    assert normalize_locale("en") is None
-    assert resolve_locale(user_locale="en", accept_language="en-US,en;q=0.9") == DEFAULT_LOCALE
+async def test_a_language_outside_the_offered_list_is_not_reachable_on_its_own():
+    # Un idioma con catalogo pero fuera de la lista ofrecida (el caso de `UNRELEASED_LOCALES`
+    # mientras se traduce) no lo alcanza nadie solo: ni por el PATCH del locale, ni por
+    # `Accept-Language`, ni por el workspace. Hoy no hay ninguno, asi que se ejercita con
+    # la lista explicita: lo que importa es el mecanismo, no que `en` siga sin ofrecerse.
+    only_spanish = ("es",)
+    assert normalize_locale("en", supported=only_spanish) is None
+    assert (
+        resolve_locale(user_locale="en", accept_language="en-US,en;q=0.9", supported=only_spanish)
+        == DEFAULT_LOCALE
+    )
     assert translate("invoice_pdf:title", "en") == "INVOICE"
 
 
+async def test_english_is_offered_and_reachable():
+    assert normalize_locale("en") == "en"
+    assert resolve_locale(accept_language="en-US,en;q=0.9") == "en-US"
+    assert resolve_locale(user_locale="en") == "en"
+
+
 async def test_every_catalogue_has_the_same_keys_as_the_default():
     catalogues = catalogue.load_catalogues()
     expected = {d: flatten(t) for d, t in catalogues[DEFAULT_LOCALE].items()}
diff --git a/backend/tests/test_locale.py b/backend/tests/test_locale.py
index 8768e67..a364f22 100644
--- a/backend/tests/test_locale.py
+++ b/backend/tests/test_locale.py
@@ -5,10 +5,10 @@
 `portal_sessions.locale`—, el PATCH del locale propio, el unico sitio donde
 `Accept-Language` importa (el registro) y el campo en `PortalSessionCreate`.
 
-Hasta la tarea 12 el unico catalogo enviado es `es`: los casos "valido" usan
-`es` y `es-MX`, y "no soportado" usa `fr`. Ese `fr` dejara de servir el dia que
-se envie un segundo idioma; el test de `test_locale_resolution.py` que fija
-`SUPPORTED_LOCALES == ("es",)` es el aviso.
+Se ofrecen `es` y `en` (tarea 12): los casos "valido" usan `es`, `es-MX` y `en`,
+y "no soportado" usa `fr`. Ese `fr` dejara de servir el dia que se envie un
+tercer idioma; el test de `test_locale_resolution.py` que fija
+`SUPPORTED_LOCALES == ("es", "en")` es el aviso.
 """
 import pytest
 from httpx import AsyncClient
@@ -139,7 +139,20 @@ async def test_patch_unsupported_locale_is_rejected_with_a_registered_code(
     assert resp.status_code == 422
     err = resp.json()["error"]
     assert err["code"] == "IDENTITY_LOCALE_UNSUPPORTED"
-    assert err["detail"]["supported"] == ["es"]
+    assert err["detail"]["supported"] == ["es", "en"]
+
+
+async def test_patch_own_locale_accepts_english_and_canonicalises_it(
+    client: AsyncClient, auth_headers: dict
+):
+    # `en` se ofrece desde que esta completo en el servidor y en la interfaz.
+    resp = await client.patch(f"{AUTH}/me", json={"locale": "en_us"}, headers=auth_headers)
+    assert resp.status_code == 200
+    assert resp.json()["locale"] == "en-US"
+    assert resp.json()["effective_locale"] == "en-US"
+
+    again = await client.get(f"{AUTH}/me", headers=auth_headers)
+    assert again.json()["locale"] == "en-US"
 
 
 async def test_rejected_locale_does_not_change_the_stored_one(
@@ -195,6 +208,15 @@ async def test_register_takes_the_default_from_accept_language(client: AsyncClie
     assert me["locale"] is None
 
 
+async def test_register_with_an_english_browser_gets_an_english_workspace(
+    client: AsyncClient,
+):
+    ws, me = await _workspace_and_me(client, await _register(client, "en-US,en;q=0.9"))
+    assert ws["default_locale"] == "en-US"
+    assert me["locale"] is None
+    assert me["effective_locale"] == "en-US"
+
+
 async def test_register_with_an_unshipped_language_falls_back_to_es(
     client: AsyncClient,
 ):
@@ -262,4 +284,15 @@ async def test_portal_session_rejects_an_unsupported_locale(
     assert resp.status_code == 422
     err = resp.json()["error"]
     assert err["code"] == "PORTAL_LOCALE_UNSUPPORTED"
-    assert err["detail"]["supported"] == ["es"]
+    assert err["detail"]["supported"] == ["es", "en"]
+
+
+async def test_portal_session_accepts_english(client: AsyncClient, auth_headers: dict):
+    quote_id = await _quote(client, auth_headers)
+    resp = await client.post(
+        f"{PORTAL}/sessions",
+        json={"quote_id": quote_id, "locale": "en"},
+        headers=auth_headers,
+    )
+    assert resp.status_code == 201, resp.text
+    assert resp.json()["locale"] == "en"
diff --git a/backend/tests/test_locale_resolution.py b/backend/tests/test_locale_resolution.py
index d9698b8..71b2ca5 100644
--- a/backend/tests/test_locale_resolution.py
+++ b/backend/tests/test_locale_resolution.py
@@ -56,15 +56,18 @@ async def test_normalize_rejects_unsupported_or_malformed(raw):
 
 
 async def test_normalize_checks_the_base_language_against_supported():
-    assert normalize_locale("en-US") is None
-    assert normalize_locale("en-US", supported=TWO) == "en-US"
+    # `fr` no tiene catalogo: ningun test debe depender de que un idioma "real" falte.
+    assert normalize_locale("fr-FR") is None
+    assert normalize_locale("fr-FR", supported=("es", "fr")) == "fr-FR"
 
 
-async def test_shipped_catalogues_today_are_spanish_only():
-    # Si esto cambia, la tarea 12 ya llego y varios tests de esta suite dejan
-    # de ser el caso limite que pretenden ser: hay que revisarlos.
-    assert SUPPORTED_LOCALES == ("es",)
+async def test_shipped_catalogues_today_are_spanish_and_english():
+    # Si esto cambia, se ha ofrecido o retirado un idioma y varios tests de esta
+    # suite dejan de ser el caso limite que pretenden ser: hay que revisarlos.
+    assert SUPPORTED_LOCALES == ("es", "en")
     assert DEFAULT_LOCALE == "es"
+    # El idioma por defecto sigue siendo el primero: es el de reserva de todo lo demas.
+    assert SUPPORTED_LOCALES[0] == DEFAULT_LOCALE
 
 
 # ── catalogue_for ────────────────────────────────────────────
diff --git a/docs/CAPABILITY_MATURITY_SCORECARD.md b/docs/CAPABILITY_MATURITY_SCORECARD.md
index b84b1ea..98f0e5c 100644
--- a/docs/CAPABILITY_MATURITY_SCORECARD.md
+++ b/docs/CAPABILITY_MATURITY_SCORECARD.md
@@ -147,4 +147,4 @@ A module may advance from Tier 3 → Tier 2 or Tier 2 → Tier 1 when it achieve
 
 **12 modules Tier 1 — 12 total modules.**
 Full wedge funnel: Discovery → Identity → CRM → Sales → Inventory → Portal → Workflows → Accounting → Notifications → Contracts → Projects → HR.
-**928 tests across 48 test files.** Q3 backlog 100% closed. Q4 G2 (overdue automation) complete. Q4 E1 (analytics real data) complete. Q4 Q1 (frontend CI type-check) complete. Q4 Q2 (invoice PDF download) complete. M1 (Contracts) complete. M2 (Projects) complete. M3 (HR/Team) complete. Fase 1 (integration tests + specs for M1/M2/M3) complete.
+**932 tests across 48 test files.** Q3 backlog 100% closed. Q4 G2 (overdue automation) complete. Q4 E1 (analytics real data) complete. Q4 Q1 (frontend CI type-check) complete. Q4 Q2 (invoice PDF download) complete. M1 (Contracts) complete. M2 (Projects) complete. M3 (HR/Team) complete. Fase 1 (integration tests + specs for M1/M2/M3) complete.
diff --git a/docs/IMPLEMENTATION_ALIGNMENT.md b/docs/IMPLEMENTATION_ALIGNMENT.md
index ab4fa8d..6706dfe 100644
--- a/docs/IMPLEMENTATION_ALIGNMENT.md
+++ b/docs/IMPLEMENTATION_ALIGNMENT.md
@@ -58,7 +58,7 @@ Legacy documents are historical reference only unless explicitly promoted by ADR
 ## Current Platform Snapshot
 
 - Active modules: identity, crm, sales, inventory, portal, discovery, workflows, notifications, accounting, analytics, contracts, projects, hr
-- Test suite: 928 automated tests across 48 test files
+- Test suite: 932 automated tests across 48 test files
 - Frontend active surface: API-backed pages aligned to the implemented backend wedge plus current Tier 1 modules
 - Public runtime surfaces:
   - `GET /health`
@@ -78,7 +78,7 @@ Legacy documents are historical reference only unless explicitly promoted by ADR
 | Frontend error surfacing | Closed and enforced by the toolchain rather than by review. All 47 `onError` handlers type the error as `Error` and pass it to `translateApiError`, which takes `unknown` and renders Spanish from the backend `code` per ADR 0014 — which also settles the old English-message inconsistency. The original bug was two handlers reading `e.response.data.detail`, an axios shape this codebase does not use, so the expression evaluated to `undefined` and the user saw a generic fallback; it survived because those handlers typed the error as `any`. Two things now stop it recurring: `@typescript-eslint/no-explicit-any` is an error and CI runs `npm run lint`, and `useUnknownInCatchVariables` closes the hole the linter cannot see — with `strict: false` a bare `catch (e)` was implicitly `any`, and reaching for a property on it now fails to compile. The only remaining `any` is scoped to `PortalBuilder.tsx` behind a justified file-level disable | Every mutation surfaces the backend's own message when it has one | Low | Keep it closed: the compiler and the linter enforce it. Lifting the `PortalBuilder.tsx` disable needs an explicit contract for block props first, and turning on full `strict` is a separate, much larger change — `strictNullChecks` is still off |
 | Runtime health signal | `GET /health` now checks Redis alongside the API and Postgres. It did not before, and that blind spot hid a real production outage: Redis was down on the deployed instance while `/health` reported `healthy`, because no ordinary HTTP route touches it — what fails silently is notifications, the workflow engine and the consumers. Verified both ways locally: stopping Redis turns the endpoint `unhealthy`, restarting it returns `healthy` | Health reflects every dependency whose loss degrades the product | Medium | When a new runtime dependency is added, add its probe in the same change set. A dependency only reached by background work is exactly the one an external probe cannot see |
 | Frontend alignment | Active routes are much cleaner than before, but docs still lag occasionally | UI backed by owned capabilities and current backend maturity | Medium | Refresh capability specs and route docs alongside feature delivery |
-| Test coverage narrative | Codebase has 928 tests across 48 test files. The four score-bearing docs (this one, `README.md`, `CAPABILITY_MATURITY_SCORECARD.md`, and the README breakdown table) now agree on that number | One accurate confidence narrative | Medium | Re-derive the count from `pytest -q` in the same change set as the feature, and update all four places at once — they drifted apart because only one was touched |
+| Test coverage narrative | Codebase has 932 tests across 48 test files. The four score-bearing docs (this one, `README.md`, `CAPABILITY_MATURITY_SCORECARD.md`, and the README breakdown table) now agree on that number | One accurate confidence narrative | Medium | Re-derive the count from `pytest -q` in the same change set as the feature, and update all four places at once — they drifted apart because only one was touched |
 | Contracts/Projects/HR production confirmation | Deploy readiness is locally verified, but no production-domain smoke evidence has been recorded in governance | Production dimension marked green only after deployed route smoke passes against the production domain and matching SHA | High | Run production smoke for `/contracts`, `/projects`, `/departments`, and `/employees` after deploy |
 | External brand-site integration | Strategic direction documented; public lead intake v1 now has code, contract tests, decision logging, event metadata, and rate-limit response behavior, but is not yet operationally proven under production-like traffic | One validated public integration slice before SDK/builder expansion | High | Run deployment-like validation for CRM public intake before expanding public surfaces |
 | Public API boundary | Portal proves public interaction can work; CRM public intake now defines the initial site-key/origin/idempotency/rate-limit model | Explicit public endpoint policy with origin, key, idempotency, abuse controls, and logging rules | High | Promote the CRM public intake contract into broader public API conventions only after production validation |
diff --git a/docs/superpowers/plans/2026-08-07-i18n-full.md b/docs/superpowers/plans/2026-08-07-i18n-full.md
index 9b21917..cdf73ba 100644
--- a/docs/superpowers/plans/2026-08-07-i18n-full.md
+++ b/docs/superpowers/plans/2026-08-07-i18n-full.md
@@ -463,9 +463,12 @@ completa migrada no hay patron que seguir.
             pestanas de Ajustes) y `workflows` (lista, historial de ejecuciones y alta).
             Los 19 espacios estan traducidos. Como `en` ya tiene todos los de `es`, el
             frontend lo ofrece solo (`releasedLocales`): selector, deteccion del navegador y
-            `setLocale`. El backend sigue sin ofrecerlo; ver el punto siguiente.
-      - [ ] Ofrecer `en`: mover `en` de `UNRELEASED_LOCALES` a `SUPPORTED_LOCALES` en el backend
-            y el selector de idioma en el dialogo de compartir (pendiente desde la tarea 2).
+            `setLocale`.
+      - [x] Ofrecer `en` en el backend: `en` pasa de `UNRELEASED_LOCALES` a
+            `SUPPORTED_LOCALES` (`("es", "en")`); el PATCH del locale, la sesion de portal,
+            `Accept-Language` en el registro y el workspace lo aceptan.
+      - [ ] Selector de idioma en el dialogo de compartir cotizacion (pendiente desde la
+            tarea 2): el backend ya guarda el idioma en la sesion de portal.
       - [ ] Recorrer la aplicacion en ingles buscando lo que el segundo idioma revela:
             cadenas concatenadas, orden de palabras, plurales, fechas e importes (decision de
             `babel` o tabla propia, pendiente desde la tarea 10).