feat(i18n): the server's closed English vocabularies named in the reader's language (E30 S2)

- lib/vocab + the `vocab` locale area: TMDB crew jobs and departments, auto-tags (D1 A: the data
  stays English, the catalog is named at its one source, useTags), built-in download profiles,
  YouTube topics; held key-for-key to the backend's own lists by backendIds.contract.
- Countries by ISO code: TMDB parse stores {code, name}; rows stored before are coded from TMDB's
  own country list in one request (run_enrich); Intl names them, historic codes (YU, SU, XI…)
  from the catalog.
- Player tracks named from the language tag, forced/SDH flags and codec tail, not Plex's
  server-language displayTitle; no invented "Audio N" on the server.
- Download lifecycle notices (shared / expiring / expired / evicted) named from data; the share
  notice carries the title.
- Scheduler: the job result rides along as data and is named per key (dashboard + run notice).
- Invite status named; a render crash's notice no longer shows the engine's English message.
- Fix: YouTube links …/wiki/Humour, the tagger looked for "Humor" — Comedy never came from a topic.

frontend/src/components/NotificationsPanel.menu.dom.test.tsx

@@ -330,3 +330,37 @@ describe("NotificationsPanel · the page's background menu", () => {
     expect(menuRows()).toEqual(["inbox.markAllRead"]);
   });
 });
+
+describe("a download-lifecycle notice (E30)", () => {
+  it("is named from its data in the reader's language, never the server's English title", () => {
+    h.server = [
+      server(1, {
+        type: "download_shared",
+        title: "Cats was shared with you",
+        body: null,
+        data: { kind: "download_shared", from: "a@b.c", title: "Cats" },
+      } as never),
+      server(2, {
+        type: "download_expiring",
+        title: "Dogs",
+        data: { kind: "download_expiring", title: "Dogs" },
+      } as never),
+      server(3, {
+        type: "download_expired",
+        title: "download", // an untitled video: the server's English fallback word
+        data: { kind: "download_expired", title: null },
+      } as never),
+      server(4, {
+        type: "download_evicted",
+        title: "Birds",
+        data: { kind: "download_evicted", title: "Birds" },
+      } as never),
+    ];
+    mount();
+    for (const key of ["downloadShared", "downloadExpiring", "downloadExpired", "downloadEvicted"])
+      expect(screen.getByText(`inbox.${key}.title`)).toBeTruthy();
+    for (const title of ["Cats", "Dogs", "Birds"]) expect(screen.getByText(title)).toBeTruthy();
+    expect(screen.queryByText("Cats was shared with you")).toBeNull();
+    expect(screen.queryByText("download")).toBeNull();
+  });
+});