Add Mailing lists to Administration

A mailing list is an address that passes mail on to everyone on it. To
Stalwart it is its own object, x:MailingList, behind sysMailingList*, so
it gets its own section under Directory after Groups: search, fifty to a
page with each list's recipient count, and a panel to create, edit and
delete one.

Recipients are a property of the list, so unlike a group's members they
save with the rest of the panel. What Save sends for them is only what was
added and removed, one recipients/<address> pointer each -- the patch the
live server accepted -- so a recipient added elsewhere while the panel was
open is not taken out. They can be pasted several at a time, from a
spreadsheet column, a comma-separated line or Name <address>; anything with
an @ that is not an address stays in the box with a note. Past a dozen, a
filter narrows them.

That is all a list is in Stalwart -- no owners, moderation or posting
rules -- so that is all the panel offers.

The mock answers x:MailingList with two lists, the recipient set's live
shape, and the refusals a wrong address, a clash with an account and a
missing permission get.

Twenty-five new strings and one plural, in all nine catalogues.

web/src/locales/es.ts

@@ -174,6 +174,31 @@ export const catalog: Catalog = {
     "Your organisation has reached the number of groups it is allowed.": "Su organización ha alcanzado el número de grupos permitido.",
     "This group no longer exists. Someone may have deleted it.": "Este grupo ya no existe. Puede que alguien lo haya eliminado.",
     "The server did not say whether the group was created.": "El servidor no indicó si el grupo se creó.",
+    "Mailing lists": "Listas de correo",
+    "Mailing list": "Lista de correo",
+    "A list needs an address.": "Una lista necesita una dirección.",
+    "New mailing list": "Nueva lista de correo",
+    "Your role lets you view mailing lists but not change them.": "Su rol le permite ver las listas de correo, pero no modificarlas.",
+    "No domains are available to create a list on.": "No hay dominios disponibles para crear una lista.",
+    "Mail to these addresses goes to the list too. Changes apply when you save.": "El correo a estas direcciones también va a la lista. Los cambios se aplican al guardar.",
+    "Create list": "Crear lista",
+    "Filter recipients": "Filtrar destinatarios",
+    "No recipients match": "Ningún destinatario coincide",
+    "Add recipients": "Añadir destinatarios",
+    "Addresses, separated by commas": "Direcciones separadas por comas",
+    "Not added, as they aren't addresses: {items}": "No se añadieron porque no son direcciones: {items}",
+    "Mail to the list is passed on to every recipient, on this server or anywhere else. Paste several at once if you like. Changes apply when you save.": "El correo a la lista se reenvía a cada destinatario, en este servidor o en cualquier otro. Puede pegar varios a la vez. Los cambios se aplican al guardar.",
+    "Mail to this address stops being passed on. The recipients' own mail is untouched.": "El correo a esta dirección deja de reenviarse. El correo propio de los destinatarios no se toca.",
+    "Delete list…": "Eliminar lista…",
+    "Delete list": "Eliminar lista",
+    "Mail to this address is no longer passed on to anyone. It can't be undone.": "El correo a esta dirección ya no se reenvía a nadie. No se puede deshacer.",
+    "Addresses that pass mail on to everyone on them.": "Direcciones que reenvían el correo a todos los que están en ellas.",
+    "Search mailing lists": "Buscar listas de correo",
+    "No mailing lists match": "Ninguna lista de correo coincide",
+    "No mailing lists yet": "Aún no hay listas de correo",
+    "Your organisation has reached the number of mailing lists it is allowed.": "Su organización ha alcanzado el número de listas de correo permitido.",
+    "This mailing list no longer exists. Someone may have deleted it.": "Esta lista de correo ya no existe. Puede que alguien la haya eliminado.",
+    "The server did not say whether the list was created.": "El servidor no indicó si la lista se creó.",
     "User": "Usuario",
     "Administrator": "Administrador",
     "Custom role": "Rol personalizado",
@@ -1569,6 +1594,7 @@ export const catalog: Catalog = {
     "{n} groups": { one: "{n} grupo", other: "{n} grupos" },
     "Its {n} members are taken out of the group first, and lose what was shared with it. The group's own mail is removed in the background, and it can't be undone.": { one: "Primero se quita del grupo a su {n} miembro, que pierde lo que se compartía con él. El correo del grupo se elimina en segundo plano, y no se puede deshacer.", other: "Primero se quita del grupo a sus {n} miembros, que pierden lo que se compartía con él. El correo del grupo se elimina en segundo plano, y no se puede deshacer." },
     "{n} mailing lists": { one: "{n} lista de correo", other: "{n} listas de correo" },
+    "{n} recipients": { one: "{n} destinatario", other: "{n} destinatarios" },
     "{n} DKIM keys": { one: "{n} clave DKIM", other: "{n} claves DKIM" },
     "{n} other items": { one: "{n} elemento más", other: "{n} elementos más" },
     // ── Administration ────────────────────────────────────────────────