Say which legacy protocols are off when only some are

inbuxa can now switch IMAP, POP3 and ManageSieve off one at a time,
server-wide and per organization, and the session lists what is still
allowed for the account (legacyAllowed). Where the webmail said
"legacy protocols are off", it now also covers the case where only
some are:

- Security & sessions, above app passwords: "Your organization has
  turned off POP3 for mail apps. Mail apps that use it can't connect
  to this account; others still can."
- The Administration dashboard: "Some legacy mail protocols are off for
  your organization: POP3."
- An organization's sheet in Administration: its switch stays the
  all-or-nothing one; when only some are off it names them and points
  to the console, where they're switched one at a time, and "Turn
  legacy protocols back on" turns them all back on.

With every protocol off, the existing wording shows, as before. From a
server that doesn't send legacyAllowed nothing new appears.

3 new strings in all nine catalogs, unreviewed.

Tested: unit tests for reading the session and a tenant's switches;
the existing tests updated for the new field; typecheck; the whole
suite (1475 tests); and in headless Chrome against a local server with
POP3 off, where Security & sessions showed the new note.

web/src/locales/ja.ts

@@ -1735,6 +1735,10 @@ export const catalog: Catalog = {
     // ── Spam filter: the language model's opinion (inbuxa) ──────────
     "Language model's opinion": "言語モデルの見解",
     "One of several signals the spam filter weighed": "迷惑メールフィルターが考慮した複数の判断材料のひとつ",
+    // inbuxa: legacy mail protocols, one switch per protocol
+    "Your organization has turned off {protocols} for mail apps. Mail apps that use it can't connect to this account; others still can.": "組織ではメールアプリ向けの {protocols} がオフになっています。これを使うメールアプリはこのアカウントに接続できませんが、ほかのアプリは接続できます。",
+    "Some legacy mail protocols are off for your organization: {protocols}.": "組織では一部の従来のメールプロトコルがオフになっています: {protocols}。",
+    "Some are off for {tenant}: {protocols}. Switch them one at a time in the administration console.": "{tenant} では一部がオフです: {protocols}。管理コンソールで 1 つずつ切り替えてください。",
     // inbuxa: deleting a person is the console's (audit-hold-lock spec)
     "Deleting, locking and legal holds are done in the administration console, which records why and keeps what a hold covers.": "削除、ロック、訴訟ホールドは管理コンソールで行います。コンソールでは理由が記録され、ホールドの対象は保持されます。",
     "Open in the console": "コンソールで開く",