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/ChannelPage.tsx

@@ -1,6 +1,6 @@
 import { useCallback, useEffect, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
-import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { useMutation, useQueryClient } from "@tanstack/react-query";
 import { useLiveQuery } from "../lib/useLiveQuery";
 import { channelDetailPollMs, useBackfillFeedRefresh } from "../lib/channelDetailPoll";
 import { qk } from "../lib/queryKeys";
@@ -42,6 +42,7 @@ import { Button } from "./ui/Button";
 import { IconButton } from "./ui/IconButton";
 import { IconLink } from "./ui/LinkButton";
 import { PageHeading } from "./ui/Headings";
+import { useTags } from "../lib/useTags";
 
 // A dedicated channel page: an "About"-style header (banner, avatar, stats, subscribe) over the
 // channel's videos (the catalog filtered to this channel). For an un-subscribed channel it
@@ -230,11 +231,7 @@ export default function ChannelPage({
   // invalidates the manager list so a tag added here shows there too.
   // Only fetch the tag catalog when the editor will actually render (subscribed, non-demo) — an
   // unsubscribed/demo channel page never shows the control, so the request would be thrown away.
-  const tagsQuery = useQuery({
-    queryKey: qk.tags(),
-    queryFn: api.tags,
-    enabled: !!ch?.subscribed && !me.is_demo,
-  });
+  const tagsQuery = useTags({ enabled: !!ch?.subscribed && !me.is_demo });
   const userTags = (tagsQuery.data ?? []).filter((tg) => !tg.system);
   const { toggleTag, createAndAttachTag } = useChannelTagActions({
     optimisticToggle: (id, tagId, attach) =>