fix: dates follow the UI language, not the browser's

Seven sites formatted with a bare toLocaleString()/toLocaleDateString(), so an
English UI on a Hungarian machine printed Hungarian-shaped dates (and the reverse).
They now go through formatDateTime/formatDate, which take the i18n language.

frontend/src/components/downloadRow.tsx

@@ -7,7 +7,14 @@ import { useLiveQuery } from "../lib/useLiveQuery";
 import { api, type DownloadJob } from "../lib/api";
 import { notify } from "../lib/notifications";
 import { copyText } from "../lib/clipboard";
-import { formatBytes, formatDuration, formatEta, formatSpeed, relativeTime } from "../lib/format";
+import {
+  formatBytes,
+  formatDateTime,
+  formatDuration,
+  formatEta,
+  formatSpeed,
+  relativeTime,
+} from "../lib/format";
 import { navItemAttrs } from "../lib/listNav";
 import { failCopyKeys } from "../lib/downloadFailure";
 
@@ -250,7 +257,7 @@ export function DownloadRow({
           {job.status === "done" && job.created_at ? (
             <span
               className="text-muted inline-flex items-center gap-1"
-              title={new Date(job.created_at).toLocaleString()}
+              title={formatDateTime(job.created_at)}
             >
               · <CalendarClock className="w-3.5 h-3.5" /> {relativeTime(job.created_at)}
             </span>