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/PlexPersonView.dom.test.tsx

@@ -113,7 +113,8 @@ describe("PlexPersonView", () => {
     expect(screen.getByText("plex.person.shows")).toBeTruthy();
 
     // E5 S6 bio hero: department, biography, birth facts, aka.
-    expect(screen.getByText("Acting")).toBeTruthy();
+    // E30: TMDB's English department, named through the vocab (key-echo i18n here).
+    expect(screen.getByText("vocab.department.Acting")).toBeTruthy();
     expect(screen.getByText("A celebrated actor.")).toBeTruthy();
     expect(screen.getByText(/1970-01-01/)).toBeTruthy();
     expect(screen.getByText(/plex\.person\.aka/)).toBeTruthy();