fix(i18n): Google controls, vessel units and counts follow the UI language

Screens that only open with provider keys showed a few gaps:

- Google Street View's own controls (Map Data, Terms, Report a problem)
  and its addresses were always English: the Maps script now loads with
  the UI language. English adds no parameter, as before.
- The selected-vessel HUD line kept KT and DEG after translated labels.
- Layer counts used a decimal point (12.0K); other languages use their
  own separator (12,0K).
- A collapsed rail title was cut with an ellipsis in Russian; tighter
  tracking fits it whole. English is unchanged.

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

src/layers/streetLevel/providers/google/index.js

@@ -1,5 +1,6 @@
 import { FOLLOW_MAP_STACK_ID } from '../../policy.js';
 import { createMapsLoader } from './mapsLoader.js';
+import { getLocale } from '../../../../i18n/index.js';
 import { createGoogleViewer } from './viewer.js';
 import {
   COLORS,
@@ -48,7 +49,7 @@ function settleWithin(promise, { ms, signal, loader }) {
  */
 export function createGoogleProvider({
   getApiKey,
-  loader = createMapsLoader({ getApiKey }),
+  loader = createMapsLoader({ getApiKey, getLanguage: getLocale }),
 }) {
   if (typeof getApiKey !== 'function')
     throw new TypeError('Google Street View needs getApiKey');

src/layers/streetLevel/providers/google/mapsLoader.js

@@ -9,10 +9,13 @@ const READY_CALLBACK = '__gevGoogleMapsReady';
 const PAGE_LOAD = Symbol.for('gev.googleMapsLoad');
 
 /**
- * @param {{getApiKey: () => string|null|undefined, document?: Document, global?: object}} options
+ * @param {{getApiKey: () => string|null|undefined, getLanguage?: () => string|null|undefined, document?: Document, global?: object}} options
+ *   `getLanguage` names the UI language; Google's own controls (Terms,
+ *   Report a problem) follow it. English adds nothing, as before.
  */
 export function createMapsLoader({
   getApiKey,
+  getLanguage,
   document = globalThis.document,
   global = globalThis,
 }) {
@@ -53,12 +56,15 @@ export function createMapsLoader({
       };
       const script = document.createElement('script');
       script.async = true;
-      script.src = `${SCRIPT_ORIGIN}/maps/api/js?${new URLSearchParams({
+      const params = new URLSearchParams({
         key,
         v: 'weekly',
         loading: 'async',
         callback: READY_CALLBACK,
-      })}`;
+      });
+      const language = getLanguage?.();
+      if (language && language !== 'en') params.set('language', language);
+      script.src = `${SCRIPT_ORIGIN}/maps/api/js?${params}`;
       script.onerror = () => {
         if (global[PAGE_LOAD] === loading) delete global[PAGE_LOAD];
         script.remove();

src/layers/streetLevel/providers/google/mapsLoader.test.mjs

@@ -142,3 +142,19 @@ test('a retried load still reports a refusal once, and the page handler once', a
   assert.deepEqual(heard, ['a']);
   assert.equal(before, 1);
 });
+
+test('Google controls follow the UI language; English adds no parameter', async () => {
+  const language = (locale) => {
+    const page = fakePage();
+    const loader = createMapsLoader({
+      getApiKey: () => 'k-1',
+      getLanguage: () => locale,
+      ...page,
+    });
+    void loader.importLibrary('streetView').catch(() => {});
+    return new URL(page.scripts[0].src).searchParams.get('language');
+  };
+  assert.equal(language('es'), 'es');
+  assert.equal(language('ru'), 'ru');
+  assert.equal(language('en'), null);
+});