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/ChannelStatsPopover.tsx

@@ -22,7 +22,8 @@ import { SURFACE } from "./ui/surfaces";
 // with a leading icon. Kept in the manager's own toolbar (the header's SyncStatus is global; these
 // are channel-catalog figures).
 export default function ChannelStatsPopover({ status }: { status: MyStatus }) {
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
+  const lang = i18n.language;
   const [open, setOpen] = useState(false);
   const pop = useAnchoredPopover({
     open,
@@ -58,7 +59,7 @@ export default function ChannelStatsPopover({ status }: { status: MyStatus }) {
           {
             icon: Clock,
             label: t("channels.stats.left"),
-            value: formatEta(status.deep_eta_seconds),
+            value: formatEta(t, status.deep_eta_seconds),
             hint: t("channels.stats.leftHint", { count: status.deep_pending_count }),
           },
         ]
@@ -66,13 +67,13 @@ export default function ChannelStatsPopover({ status }: { status: MyStatus }) {
     {
       icon: Film,
       label: t("channels.stats.myVideos"),
-      value: formatNumber(status.my_videos),
+      value: formatNumber(status.my_videos, lang),
       hint: t("channels.stats.myVideosHint"),
     },
     {
       icon: Zap,
       label: t("channels.stats.quotaLeft"),
-      value: formatNumber(status.quota_remaining_today),
+      value: formatNumber(status.quota_remaining_today, lang),
       hint: t("channels.stats.quotaLeftHint"),
     },
   ];