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/DiagnosticsSettings.tsx

@@ -40,7 +40,8 @@ function useRemaining(until: string | null): { h: number; m: number } | null {
 // the server keeps it and for how long, and that it lapses; only its button raises the level.
 // Returning to Alap needs no consent and happens at once.
 export default function DiagnosticsSettings() {
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
+  const lang = i18n.language;
   const me = useMe();
   const qc = useQueryClient();
   const state = me.diagnostics;
@@ -173,8 +174,8 @@ export default function DiagnosticsSettings() {
                   level: levelName(current),
                   time:
                     remaining.h > 0
-                      ? `${formatUnit(remaining.h, "hour")} ${formatUnit(remaining.m, "minute")}`
-                      : formatUnit(remaining.m, "minute"),
+                      ? `${formatUnit(remaining.h, "hour", lang)} ${formatUnit(remaining.m, "minute", lang)}`
+                      : formatUnit(remaining.m, "minute", lang),
                 })}
               </span>
             </span>