fix(i18n): numbers, units, dates and order in the UI language, and after a switch (E30 S3)

Every locale formatter takes the language as an argument. Under the React
Compiler a formatter that read the i18n singleton was memoized on its other
arguments, so a card kept "2 hr 4 min" after a switch to Hungarian; plexLang()
had the same flaw and left Plex queries in the old language. Components now
take the language from useTranslation, and the signature makes forgetting it
a type error.

- ratings, file sizes, stream stats: the language's decimal mark ("8,3")
- view and subscriber counts compact in the language ("1,2 E")
- seconds as the language's unit ("6 mp") in the sliders and the stats
- a person's birth and death dates as dates, not ISO strings
- A-Z lists by the shown name in the language's alphabet (compareText),
  the tag catalog re-sorted by its translated names
- lint local/locale-format (was date-format) also refuses Intl.NumberFormat
  outside lib/format.ts, localeCompare, and a component reading the language
  off the i18n singleton

frontend/src/components/ChannelDiscovery.tsx

@@ -41,7 +41,8 @@ export default function ChannelDiscovery({
   onOpenWizard: () => void;
   onViewChannel: (id: string, name: string) => void;
 }) {
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
+  const lang = i18n.language;
   const qc = useQueryClient();
   const confirm = useConfirm();
   // The table/cards density is shared with the Subscriptions tab (ChannelsProvider). The sort is
@@ -148,7 +149,7 @@ export default function ChannelDiscovery({
       hideInCard: true,
       render: (c) => <AboutCell text={c.description} channelId={c.id} />,
     },
-    subsColumn<DiscoveredChannel>(t),
+    subsColumn<DiscoveredChannel>(t, lang),
     {
       key: "videos",
       header: t("channels.discovery.cols.totalVideos"),
@@ -157,7 +158,7 @@ export default function ChannelDiscovery({
       sortable: true,
       sortValue: (c) => c.video_count ?? -1,
       render: (c) => (
-        <span className="text-muted tabular-nums">{formatCountOrDash(c.video_count)}</span>
+        <span className="text-muted tabular-nums">{formatCountOrDash(c.video_count, lang)}</span>
       ),
     },
     {
@@ -186,7 +187,7 @@ export default function ChannelDiscovery({
   // computed for cards — DataTable sorts and slices internally, so doing it in table mode too would
   // copy+sort the whole list every render for a result nothing reads.
   const isCards = layout === "cards";
-  const sortedRows = isCards ? sortRows(rows, columns, sort) : rows;
+  const sortedRows = isCards ? sortRows(rows, columns, sort, lang) : rows;
   const {
     paged: pagedRows,
     pagerProps,