i18n(pt): complete and ship Brazilian Portuguese

- Translate the remaining 1,868 strings (pt-BR, as in #909) and review the
  contributor entries: HUD codes BRG/SPD/RANGE stay as in the other
  languages, sentence-case layer and scene names, Space key named as on the
  keyboard, short PREV/NEXT/ON/OFF chips, and the CLDR many form (exact
  millions take «de») on every plural.
- Register pt: any pt tag (pt-BR, pt-PT) maps to it; the picker shows
  «Português (Brasil)».
- Codes, units and product names identical to English go to
  same-as-english.json.
- docs/translations/pt.md: style, plurals, units and glossary.

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

src/i18n/i18n.test.mjs

@@ -34,6 +34,8 @@ test('normalizeLocale folds regional variants and rejects unshipped tags', () =>
   assert.equal(normalizeLocale('ru-RU'), 'ru');
   assert.equal(normalizeLocale(' RU '), 'ru');
   assert.equal(normalizeLocale('en_GB'), 'en');
+  assert.equal(normalizeLocale('pt-BR'), 'pt');
+  assert.equal(normalizeLocale('pt_PT'), 'pt');
   assert.equal(normalizeLocale('xx'), null);
   // Explicit script tags take precedence over regional defaults.
   assert.equal(normalizeLocale('zh'), 'zh-CN');
@@ -142,6 +144,20 @@ test('tn() picks English and Russian plural forms', () => {
   assert.match(label(21), / 21 КЛЮЧ(?![А-ЯЁ])/);
 });
 
+test('tn() picks the Portuguese one, many and other forms', () => {
+  const label = (count) =>
+    tn(
+      count,
+      'POWER UP · {count} KEY WAITING',
+      'POWER UP · {count} KEYS WAITING',
+    );
+  setLocale('pt');
+  assert.equal(label(0), 'ATIVAR · 0 CHAVE PENDENTE');
+  assert.equal(label(1), 'ATIVAR · 1 CHAVE PENDENTE');
+  assert.equal(label(3), 'ATIVAR · 3 CHAVES PENDENTES');
+  assert.equal(label(1_000_000), 'ATIVAR · 1000000 DE CHAVES PENDENTES');
+});
+
 test('t() context separates identical English with different meanings', () => {
   assert.equal(t('CLEAR', { context: 'action' }), 'CLEAR');
   setLocale('ru');

src/i18n/index.js

@@ -17,11 +17,18 @@ import {
   writeStoredLocale,
 } from './locale.js';
 import es from './locales/es.json' with { type: 'json' };
+import pt from './locales/pt.json' with { type: 'json' };
 import ru from './locales/ru.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,
+  pt,
+  ru,
+  'zh-CN': zhCN,
+  'zh-Hant': zhHant,
+});
 
 let currentLocale = DEFAULT_LOCALE;
 

src/i18n/locale.js

@@ -8,12 +8,20 @@ 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',
+  'pt',
+  'ru',
+  'zh-CN',
+  'zh-Hant',
+]);
 
 /** Each locale named in its own language, for the selector. */
 export const LOCALE_NAMES = Object.freeze({
   en: 'English',
   es: 'Español',
+  pt: 'Português (Brasil)',
   ru: 'Русский',
   'zh-CN': '中文（简体）',
   'zh-Hant': '中文（繁體）',
@@ -24,6 +32,7 @@ const RTL_LOCALES = Object.freeze([]);
 
 /**
  * Map any language tag to a shipped locale: 'ru-RU' and 'RU' → 'ru',
+ * 'pt-BR' and 'pt-PT' → 'pt' (Brazilian Portuguese),
  * 'zh', 'zh-CN' and 'zh-Hans-SG' → 'zh-CN';
  * 'zh-Hant', 'zh-TW', 'zh-HK' and 'zh-MO' → 'zh-Hant'.
  * @returns {string|null}

src/i18n/same-as-english.json

@@ -124,6 +124,131 @@
     "ΔN",
     "▲ {frp} MW"
   ],
+  "pt": [
+    "1090 MHz",
+    "978 MHz UAT",
+    "AIS: --",
+    "AIS: {name}",
+    "ALTITUDE",
+    "ALTITUDE · FT",
+    "ANIME",
+    "AUTO",
+    "Altitude {altitude}",
+    "Anime",
+    "Austin",
+    "BIKE",
+    "BRG {value}°",
+    "BRG —",
+    "Bloom",
+    "Blues",
+    "CAL {value}",
+    "CAL · {badge}",
+    "CCTV",
+    "CRS {value}°",
+    "CRT",
+    "Country",
+    "DEST ---°",
+    "DEST {bearing}",
+    "Dance",
+    "Drone",
+    "Dubai",
+    "ENE",
+    "ESE",
+    "FLIR",
+    "FLT",
+    "FM MHZ",
+    "FOV",
+    "FOV {value}°",
+    "FT",
+    "Folk",
+    "Funk",
+    "GEO",
+    "GOOGLE STREET VIEW",
+    "Global",
+    "Global · 60°S–60°N",
+    "Google Street View",
+    "HDG",
+    "HDG {value}°",
+    "Hip-Hop",
+    "House",
+    "Indie",
+    "Ironbow",
+    "Jazz",
+    "LOCAL",
+    "Landsat 8/9",
+    "Landsat 8/9 via HLS",
+    "Layout",
+    "Los Angeles",
+    "MIC",
+    "MIL",
+    "MINI",
+    "MM",
+    "MONITOR",
+    "MSG/S",
+    "Metal",
+    "NAV",
+    "NE",
+    "NNE",
+    "NOIR",
+    "NORMAL",
+    "NVG",
+    "Noir",
+    "Normal",
+    "OCEANIA",
+    "OK",
+    "POS: {time}Z",
+    "PRECIP",
+    "Paris",
+    "Pop",
+    "Punk",
+    "RANGE",
+    "Reggae",
+    "Rock",
+    "S2 GhostMaps",
+    "SAR",
+    "SE",
+    "SIG",
+    "SNAPSHOT",
+    "SQUAWK {code} · {status}",
+    "SSE",
+    "STATUS",
+    "STATUS · ",
+    "Sentinel-2",
+    "Sentinel-2 via HLS",
+    "Sonar",
+    "Soul",
+    "TAGS · {tags}",
+    "TEMP",
+    "Tallinn",
+    "Techno",
+    "Trance",
+    "USB {rate} msg/s",
+    "VISUAL",
+    "VOLUME",
+    "VS",
+    "WHOT/BHOT",
+    "WX",
+    "dB",
+    "fire confidence|nominal",
+    "ft",
+    "hPa",
+    "installation class|BASE",
+    "km",
+    "km/h",
+    "kt",
+    "min",
+    "mini",
+    "mph",
+    "nominal",
+    "view band|GLOBAL",
+    "{rate} msg/s",
+    "{type}  SPD: {speed}  HDG: {heading}",
+    "{value} KM",
+    "{value} KM/H",
+    "{value} KM/S",
+    "ΔN",
+    "▲ {frp} MW"
+  ],
   "ru": [
     "AIS: --",
     "AIS: {name}",

src/ui/localePicker.test.mjs

@@ -40,7 +40,7 @@ test('the current language comes first, the rest by their own names', () => {
         nativeNames: LOCALE_NAMES,
       }),
     ),
-    ['ru', 'en', 'es', 'zh-CN', 'zh-Hant'],
+    ['ru', 'en', 'es', 'pt', 'zh-CN', 'zh-Hant'],
   );
   assert.deepEqual(
     codes(
@@ -50,7 +50,7 @@ test('the current language comes first, the rest by their own names', () => {
         nativeNames: LOCALE_NAMES,
       }),
     ),
-    ['es', 'en', 'ru', 'zh-CN', 'zh-Hant'],
+    ['es', 'en', 'pt', 'ru', 'zh-CN', 'zh-Hant'],
   );
   assert.deepEqual(
     codes(
@@ -60,7 +60,7 @@ test('the current language comes first, the rest by their own names', () => {
         nativeNames: LOCALE_NAMES,
       }),
     ),
-    ['en', 'es', 'ru', 'zh-CN', 'zh-Hant'],
+    ['en', 'es', 'pt', 'ru', 'zh-CN', 'zh-Hant'],
   );
   const rows = buildLocaleOptions({
     locales: MANY,