i18n(uk): complete and ship Ukrainian

- Translate the remaining 1,895 strings for the current UI (Bhote Koshi
  event, weather, imagery, street level, directions, SDR, voice, scenes,
  import) and review meirm's 832 entries from #312: 134 edited for
  Ukrainian HUD terms (КУРС/ПЕЛ./ШЛЯХ/ПРИЗН., Л/П, ОНЛАЙН for LIVE,
  Cyrillic units КМ, ВУЗ, ФТ, МВт), vessel types, number agreement and
  the ʼ apostrophe throughout.
- Register uk: catalog, LOCALES, LOCALE_NAMES (Українська), package
  boundaries, same-as-English codes; picker and plural tests cover the
  four Ukrainian forms.
- docs/translations/uk.md: style, plurals, units and glossary.

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

src/i18n/i18n.test.mjs

@@ -33,6 +33,8 @@ function memoryStorage(initial = {}) {
 test('normalizeLocale folds regional variants and rejects unshipped tags', () => {
   assert.equal(normalizeLocale('ru-RU'), 'ru');
   assert.equal(normalizeLocale(' RU '), 'ru');
+  assert.equal(normalizeLocale('uk'), 'uk');
+  assert.equal(normalizeLocale('uk-UA'), 'uk');
   assert.equal(normalizeLocale('en_GB'), 'en');
   assert.equal(normalizeLocale('xx'), null);
   // Explicit script tags take precedence over regional defaults.
@@ -142,6 +144,22 @@ test('tn() picks English and Russian plural forms', () => {
   assert.match(label(21), / 21 КЛЮЧ(?![А-ЯЁ])/);
 });
 
+test('tn() picks the four Ukrainian plural forms', () => {
+  const label = (count) =>
+    tn(
+      count,
+      'POWER UP · {count} KEY WAITING',
+      'POWER UP · {count} KEYS WAITING',
+    );
+  setLocale('uk');
+  assert.match(label(1), / 1 КЛЮЧ(?![А-ЯҐЄІЇ])/);
+  assert.match(label(3), / 3 КЛЮЧІ(?![А-ЯҐЄІЇ])/);
+  assert.match(label(5), / 5 КЛЮЧІВ(?![А-ЯҐЄІЇ])/);
+  assert.match(label(11), / 11 КЛЮЧІВ(?![А-ЯҐЄІЇ])/);
+  assert.match(label(21), / 21 КЛЮЧ(?![А-ЯҐЄІЇ])/);
+  assert.match(label(1.5), / 1\.5 КЛЮЧА(?![А-ЯҐЄІЇ])/);
+});
+
 test('t() context separates identical English with different meanings', () => {
   assert.equal(t('CLEAR', { context: 'action' }), 'CLEAR');
   setLocale('ru');

src/i18n/index.js

@@ -18,10 +18,17 @@ import {
 } from './locale.js';
 import es from './locales/es.json' with { type: 'json' };
 import ru from './locales/ru.json' with { type: 'json' };
+import uk from './locales/uk.json' with { type: 'json' };
 import zhCN from './locales/zh-CN.json' with { type: 'json' };
 import zhHant from './locales/zh-Hant.json' with { type: 'json' };
 
-const CATALOGS = Object.freeze({ es, ru, 'zh-CN': zhCN, 'zh-Hant': zhHant });
+const CATALOGS = Object.freeze({
+  es,
+  ru,
+  uk,
+  'zh-CN': zhCN,
+  'zh-Hant': zhHant,
+});
 
 let currentLocale = DEFAULT_LOCALE;
 

src/i18n/locale.js

@@ -8,13 +8,21 @@ export const LOCALE_STORAGE_KEY = 'gev:locale:v1';
 export const DEFAULT_LOCALE = 'en';
 
 /** Shipped locales; order does not matter. Adding one: docs/TRANSLATORS.md. */
-export const LOCALES = Object.freeze(['en', 'es', 'ru', 'zh-CN', 'zh-Hant']);
+export const LOCALES = Object.freeze([
+  'en',
+  'es',
+  'ru',
+  'uk',
+  'zh-CN',
+  'zh-Hant',
+]);
 
 /** Each locale named in its own language, for the selector. */
 export const LOCALE_NAMES = Object.freeze({
   en: 'English',
   es: 'Español',
   ru: 'Русский',
+  uk: 'Українська',
   'zh-CN': '中文（简体）',
   'zh-Hant': '中文（繁體）',
 });

src/i18n/same-as-english.json

@@ -142,6 +142,19 @@
     "VS",
     "WHOT/BHOT"
   ],
+  "uk": [
+    "AIS: --",
+    "AIS: {name}",
+    "CCTV",
+    "CRT",
+    "FLIR",
+    "Ironbow",
+    "Landsat 8/9",
+    "NVG",
+    "REC",
+    "S2 GhostMaps",
+    "WHOT/BHOT"
+  ],
   "zh-CN": [
     "1090 MHz",
     "978 MHz UAT",