Follow what the live server does with tenants and domains

A run on the production server with throwaway tenants, a role, lists and a
domain, all removed, found three things the source reading had not:

- Something in a tenant has to be on a domain in that tenant (a list in a
  tenant on an unassigned domain is invalidForeignKey), while something in
  no tenant may be on a tenant's domain. The account panel's tenant choice
  offered every tenant; it offers only the domain's now, and a new account
  starts in the tenant of the domain it is made on. The domain list reads
  memberTenantId for it.
- A domain created in a tenant puts its DKIM keys there too, and they keep
  the tenant from being deleted. They are counted with the rest, so Delete
  is not offered while any remain.
- Stalwart lets a domain leave a tenant while the tenant still has accounts
  on it, stranding them. The panel asks first and refuses while any are
  there.

The refusal to delete a tenant that holds anything was confirmed, as were
tenant create, quota pointers, logo and rename. The mock follows the domain
rule, filters DKIM keys by tenant, and KNOWN-ISSUES records the run.

The non-Enterprise notice is now just "Tenants are a Stalwart Enterprise
feature." Two sentences were reworded and one plural added, in all nine
catalogues, and the old sentences are gone.

web/src/locales/es.ts

@@ -253,7 +253,7 @@ export const catalog: Catalog = {
     "The server did not say whether the role was created.": "El servidor no indicó si el rol se creó.",
     "No tenant": "Sin inquilino",
     "You can't move your own account into a tenant.": "No puede mover su propia cuenta a un inquilino.",
-    "An account in a tenant is limited by the tenant's role and counts towards its limits, and Administrator means administrator of that tenant.": "Una cuenta de un inquilino está limitada por el rol del inquilino y cuenta para sus límites, y Administrador significa administrador de ese inquilino.",
+    "An account can be in the tenant its domain is in. In a tenant it is limited by the tenant's role and counts towards its limits, and Administrator means administrator of that tenant.": "Una cuenta puede estar en el inquilino en el que está su dominio. En un inquilino está limitada por el rol del inquilino y cuenta para sus límites, y Administrador significa administrador de ese inquilino.",
     "Tenants": "Inquilinos",
     "Storage in GB": "Almacenamiento en GB",
     "Default tenant roles": "Roles de inquilino predeterminados",
@@ -276,13 +276,13 @@ export const catalog: Catalog = {
     "Take {domain} out of the tenant": "Quitar {domain} del inquilino",
     "No domains in this tenant yet": "Aún no hay dominios en este inquilino",
     "Domain to add": "Dominio para añadir",
-    "Only domains in no tenant can be added. The accounts already on a domain stay where they are; move each from its own panel.": "Solo se pueden añadir dominios que no estén en ningún inquilino. Las cuentas que ya están en un dominio se quedan donde están; mueva cada una desde su propio panel.",
+    "Only domains in no tenant can be added, and the accounts already on one stay where they are. A domain comes out only once none of this tenant's accounts are on it.": "Solo se pueden añadir dominios que no estén en ningún inquilino, y las cuentas que ya están en uno se quedan donde están. Un dominio solo se puede quitar cuando ninguna cuenta de este inquilino esté en él.",
     "An empty tenant can be deleted.": "Un inquilino vacío se puede eliminar.",
     "Delete tenant…": "Eliminar inquilino…",
     "Still holds {things}. Move them out first.": "Aún tiene {things}. Muévalos primero.",
     "Delete tenant": "Eliminar inquilino",
     "Separate organisations on one server, each with its own people, domains and limits.": "Organizaciones separadas en un mismo servidor, cada una con sus propias personas, dominios y límites.",
-    "Tenants are a Stalwart Enterprise feature. This server does not report Enterprise, so anyone inside a tenant has only an ordinary user's permissions.": "Los inquilinos son una función de Stalwart Enterprise. Este servidor no indica Enterprise, así que cualquiera dentro de un inquilino solo tiene los permisos de un usuario normal.",
+    "Tenants are a Stalwart Enterprise feature.": "Los inquilinos son una función de Stalwart Enterprise.",
     "Search tenants": "Buscar inquilinos",
     "No tenants match": "Ningún inquilino coincide",
     "No tenants yet": "Aún no hay inquilinos",
@@ -1689,6 +1689,7 @@ export const catalog: Catalog = {
     "Grants {n} permissions": { one: "Concede {n} permiso", other: "Concede {n} permisos" },
     "{n} roles": { one: "{n} rol", other: "{n} roles" },
     "{n} tenants": { one: "{n} inquilino", other: "{n} inquilinos" },
+    "{n} accounts in this tenant are still on {domain}. Move them or delete them before taking the domain out.": { one: "{n} cuenta de este inquilino sigue en {domain}. Muévala o elimínela antes de quitar el dominio.", other: "{n} cuentas de este inquilino siguen en {domain}. Muévalas o elimínelas antes de quitar el dominio." },
     "{n} DKIM keys": { one: "{n} clave DKIM", other: "{n} claves DKIM" },
     "{n} other items": { one: "{n} elemento más", other: "{n} elementos más" },
     // ── Administration ────────────────────────────────────────────────