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/PlexStatsOverlay.tsx

@@ -38,7 +38,8 @@ export function PlexStatsOverlay({
   durationRef: RefObject<number>;
   onClose: () => void;
 }) {
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
+  const lang = i18n.language;
   const [rows, setRows] = useState<StatRow[]>([]);
 
   useEffect(() => {
@@ -87,6 +88,7 @@ export function PlexStatsOverlay({
 
       setRows(
         buildStatRows({
+          lang,
           playable,
           hwEncoder: hwRef.current,
           tonemap: tonemapRef.current,
@@ -110,6 +112,7 @@ export function PlexStatsOverlay({
     const iv = setInterval(sample, 1000);
     return () => clearInterval(iv);
   }, [
+    lang,
     videoRef,
     hlsRef,
     fragMeterRef,