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/UploadDialog.tsx

@@ -21,7 +21,8 @@ import { Input } from "./ui/Input";
 // file is streamed to the server via XHR so this dialog can show real upload progress. On success it
 // lands in the Library as an already-`done` job, so we invalidate + point the user there.
 export default function UploadDialog({ onClose }: { onClose: () => void }) {
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
+  const lang = i18n.language;
   const qc = useQueryClient();
   const [file, setFile] = useState<File | null>(null);
   const [name, setName] = useState("");
@@ -148,7 +149,7 @@ export default function UploadDialog({ onClose }: { onClose: () => void }) {
           <>
             <FileIcon className="w-6 h-6 text-muted" />
             <span className="text-sm font-medium break-all">{file.name}</span>
-            <span className="text-xs text-muted">{formatBytes(file.size)}</span>
+            <span className="text-xs text-muted">{formatBytes(file.size, lang)}</span>
           </>
         ) : (
           <>
@@ -172,7 +173,7 @@ export default function UploadDialog({ onClose }: { onClose: () => void }) {
 
       {tooBig && (
         <p key={pickSeq} id={refusalId} className="text-xs text-danger mt-2" role="alert">
-          {t("downloads.errors.upload.tooLarge", { size: formatBytes(cap ?? 0) })}
+          {t("downloads.errors.upload.tooLarge", { size: formatBytes(cap ?? 0, lang) })}
         </p>
       )}