i18n: fix the final pre-merge review findings

Fixes the P1 and the confirmed P2 findings of the final review of the
i18n branch.

- CI: the air-quality model no longer imports i18n (portable module),
  so check:boundaries passes again.
- Air quality layer: named in the layer panel, HUD and voice; its
  Weather card, bands and errors translate. A test keeps the layer-name
  table in step with the layer registry.
- Layer statuses that still reached ru/es in English: GNSS, CelesTrak,
  Transit loading and feed errors, launches, perimeters, ALPR, ECCC,
  wind "field unavailable", Local ADS-B streaming lines.
- Voice and HUD: preset ids show city names ("Fly to San Francisco"),
  the HUD city translates, cockpit refusals cover frame, aircraft and
  satellite; empty Transit notes translate on the analyst card.
- tn() keeps a caller's formatted count ("12,345 map objects").
- Cyber HUD: the language button no longer covers the bottom-right
  card or the cockpit position readout.
- CCTV buttons wrap only in non-English locales; English layout matches
  main again.
- Switching language asks first when Provider Settings holds unsaved
  keys.

Catalogs: es/ru 2611 messages each, complete.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/ui/layerPanel.js

@@ -19,6 +19,7 @@ import {
   getLocale,
   msg,
   t,
+  tn,
   translateKnown,
 } from '../i18n/index.js';
 
@@ -187,6 +188,27 @@ const FEED_ERROR_PATTERNS = [
     /^Vector tiles unavailable \(HTTP (\d+)\)$/,
     ([, status]) => t('Vector tiles unavailable (HTTP {status})', { status }),
   ],
+  // Layer statuses with a number or a feed name in them: GNSS
+  // (gnss/source.js), CelesTrak groups (satellites/ingestion.js) and transit
+  // feeds (transit/ingestion.js).
+  [
+    /^GNSS feed unavailable \(HTTP (\d{3})\)$/,
+    ([, status]) => t('GNSS feed unavailable (HTTP {status})', { status }),
+  ],
+  [
+    /^(\d+) CelesTrak groups? unavailable$/,
+    ([, groups]) =>
+      tn(
+        Number(groups),
+        '{count} CelesTrak group unavailable',
+        '{count} CelesTrak groups unavailable',
+        { count: formatNumber(Number(groups)) },
+      ),
+  ],
+  [
+    /^(.+) feed unavailable$/,
+    ([, feed]) => t('{feed} feed unavailable', { feed: translateKnown(feed) }),
+  ],
   [
     /^Source snapshot (\d+) min old$/,
     ([, minutes]) => t('Source snapshot {minutes} min old', { minutes }),
@@ -222,9 +244,8 @@ const FEED_ERROR_PATTERNS = [
   ],
 ];
 
-/** A layer's error text in the UI language (see FEED_ERRORS). */
-export function translateFeedError(text) {
-  if (typeof text !== 'string') return text;
+/** One error text in the UI language, or null when nothing matches. */
+function feedErrorText(text) {
   if (FEED_ERRORS.has(text)) return t(text);
   const known = translateKnown(text);
   if (known !== text) return known;
@@ -232,17 +253,88 @@ export function translateFeedError(text) {
     const match = pattern.exec(text);
     if (match) return format(match);
   }
-  return text;
+  return null;
+}
+
+/**
+ * A layer's error text in the UI language (see FEED_ERRORS). An error made of
+ * several statuses joined by " · " (Local ADS-B) translates piece by piece.
+ */
+export function translateFeedError(text) {
+  if (typeof text !== 'string') return text;
+  const whole = feedErrorText(text);
+  if (whole !== null) return whole;
+  if (!text.includes(ROW_TEXT_SEPARATOR)) return text;
+  return text
+    .split(ROW_TEXT_SEPARATOR)
+    .map((piece) => feedErrorText(piece) ?? translateStatusPiece(piece))
+    .join(ROW_TEXT_SEPARATOR);
 }
 
 const ROW_TEXT_SEPARATOR = ' · ';
 
+// Feed states named in a Local ADS-B feed problem ("feeds 1090, 978 stale").
+const FEED_PROBLEM_FORMS = Object.freeze({
+  stale: (count, names) =>
+    tn(count, 'feed {names} stale', 'feeds {names} stale', { names }),
+  unreachable: (count, names) =>
+    tn(count, 'feed {names} unreachable', 'feeds {names} unreachable', {
+      names,
+    }),
+  invalid: (count, names) =>
+    tn(count, 'feed {names} invalid', 'feeds {names} invalid', { names }),
+});
+
+// Working texts with a number or a name in them arrive as English data, one
+// piece of a " · " joined line each: transit (transit/queries.js) and Local
+// ADS-B (localAdsb/status.js). Keep these in step with the producers.
+const STATUS_PIECE_PATTERNS = [
+  [/^Loading (.+)$/, ([, feeds]) => t('Loading {feeds}', { feeds })],
+  [
+    /^(\d+) heard$/,
+    ([, heard]) =>
+      tn(Number(heard), '{count} heard', '{count} heard', {
+        count: formatNumber(Number(heard)),
+      }),
+  ],
+  [
+    /^(USB )?(\d+(?:\.\d+)?) msg\/s$/,
+    ([, usb, rate]) =>
+      usb
+        ? t('USB {rate} msg/s', { rate: formatNumber(Number(rate)) })
+        : t('{rate} msg/s', { rate: formatNumber(Number(rate)) }),
+  ],
+  [
+    /^(\d+) feeds? live$/,
+    ([, live]) =>
+      tn(Number(live), '{count} feed live', '{count} feeds live', {
+        count: formatNumber(Number(live)),
+      }),
+  ],
+  [
+    /^feeds? (.+) (stale|unreachable|invalid)$/,
+    ([, names, status]) =>
+      FEED_PROBLEM_FORMS[status](names.split(', ').length, names),
+  ],
+];
+
+/** One piece of a status line in the UI language, or as it came. */
+function translateStatusPiece(piece) {
+  const known = translateKnown(piece);
+  if (known !== piece) return known;
+  for (const [pattern, format] of STATUS_PIECE_PATTERNS) {
+    const match = pattern.exec(piece);
+    if (match) return format(match);
+  }
+  return piece;
+}
+
 /** A loading label is English data, at times several joined by " · ". */
 function translateLoadingLabel(label) {
   return label
     .trim()
     .split(ROW_TEXT_SEPARATOR)
-    .map(translateKnown)
+    .map(translateStatusPiece)
     .join(ROW_TEXT_SEPARATOR);
 }
 // A short Latin code joined by hyphens. Longer runs (a URL, a token in an