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/Channels.tsx

@@ -107,7 +107,8 @@ export default function Channels() {
   const { openChannel: onViewChannel, setPage } = useNavigationActions();
   const feedFilters = useFeedFilters();
   const { setFilters: setFeedFilters } = useFeedFiltersActions();
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
+  const lang = i18n.language;
   const qc = useQueryClient();
 
   // Clicking a tag chip filters the feed by that tag and jumps there. Internalised (was an App
@@ -364,6 +365,7 @@ export default function Channels() {
 
   const columns = buildChannelColumns({
     t,
+    lang: i18n.language,
     prioOptions,
     userTags,
     bumpPriority,
@@ -471,7 +473,7 @@ export default function Channels() {
   // Cards have no column headers, so apply the shared column filters (sync + any funnel set in table
   // mode) here via the exported predicate — the same filterRows DataTable runs internally — then sort.
   const sortedChannels = isCards
-    ? sortRows(filterRows(syncedChannels, columns, filters), columns, sort)
+    ? sortRows(filterRows(syncedChannels, columns, filters), columns, sort, lang)
     : syncedChannels;
   const {
     paged: pagedCards,