i18n(de): complete and ship German

- Translate the remaining 1,868 strings in a neutral infinitive style (no
  Sie/du), with German compounds, decimal commas and CLDR one/other plurals.
- Review the #908 entries: knots are kn everywhere, the avionics codes BRG,
  CRS and DEST stay English like HDG and SPD, expand/collapse is
  ausklappen/einklappen, the radio toggle reads EIN/AUS, density SPARSE is
  DÜNN, the Thermal style is Wärmebild, German quotes in the shot prompt.
- Register de: catalog, LOCALES, LOCALE_NAMES (Deutsch), package boundaries,
  same-as-english (codes, product names, music genres, units).
- Tests: picker order and keyboard model with Deutsch, de/de-AT/de_CH
  normalization, browser de-DE resolves to German.
- docs/translations/de.md: style, plurals, units and glossary; TRANSLATORS.md
  and CURRENT-STATE.md list German.

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

src/i18n/i18n.test.mjs

@@ -34,6 +34,9 @@ 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('de'), 'de');
+  assert.equal(normalizeLocale('de-AT'), 'de');
+  assert.equal(normalizeLocale('de_CH'), 'de');
   assert.equal(normalizeLocale('xx'), null);
   // Explicit script tags take precedence over regional defaults.
   assert.equal(normalizeLocale('zh'), 'zh-CN');
@@ -68,7 +71,7 @@ test('resolveLocale: ?lang= wins, then the stored choice, then browser languages
     resolveLocale({
       location: { search: '?lang=xx' },
       storage: memoryStorage(),
-      languages: ['de-DE', 'ru-RU'],
+      languages: ['ko-KR', 'ru-RU'],
     }),
     'ru',
   );
@@ -76,7 +79,15 @@ test('resolveLocale: ?lang= wins, then the stored choice, then browser languages
     resolveLocale({
       location: { search: '' },
       storage: memoryStorage(),
-      languages: ['de'],
+      languages: ['de-DE', 'ru-RU'],
+    }),
+    'de',
+  );
+  assert.equal(
+    resolveLocale({
+      location: { search: '' },
+      storage: memoryStorage(),
+      languages: ['ko'],
     }),
     'en',
   );

src/i18n/index.js

@@ -16,12 +16,19 @@ import {
   normalizeLocale,
   writeStoredLocale,
 } from './locale.js';
+import de from './locales/de.json' with { type: 'json' };
 import es from './locales/es.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({
+  de,
+  es,
+  ru,
+  'zh-CN': zhCN,
+  'zh-Hant': zhHant,
+});
 
 let currentLocale = DEFAULT_LOCALE;
 

src/i18n/locale.js

@@ -8,11 +8,19 @@ 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',
+  'de',
+  'es',
+  'ru',
+  'zh-CN',
+  'zh-Hant',
+]);
 
 /** Each locale named in its own language, for the selector. */
 export const LOCALE_NAMES = Object.freeze({
   en: 'English',
+  de: 'Deutsch',
   es: 'Español',
   ru: 'Русский',
   'zh-CN': '中文（简体）',
@@ -24,6 +32,7 @@ const RTL_LOCALES = Object.freeze([]);
 
 /**
  * Map any language tag to a shipped locale: 'ru-RU' and 'RU' → 'ru',
+ * 'de-AT' and 'de_CH' → 'de',
  * '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

@@ -1,4 +1,168 @@
 {
+  "de": [
+    "1090 MHz",
+    "978 MHz UAT",
+    "AIS: --",
+    "AIS: {name}",
+    "ANIME",
+    "AUTO",
+    "Alternative",
+    "Ambient",
+    "Anime",
+    "Austin",
+    "BRG {value}°",
+    "BRG —",
+    "Bloom",
+    "Blues",
+    "Bus",
+    "CCTV",
+    "COCKPIT",
+    "CRS {value}°",
+    "CRT",
+    "Country",
+    "Cyan",
+    "Cyber",
+    "DEST ---°",
+    "DEST {bearing}",
+    "Dance",
+    "Details",
+    "Dubai",
+    "FALLBACK",
+    "FILTER",
+    "FLIR",
+    "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",
+    "Hybrid",
+    "Indie",
+    "Ironbow",
+    "Jazz",
+    "LIVE",
+    "Landsat 8/9",
+    "Latin",
+    "Layout",
+    "London",
+    "Los Angeles",
+    "MIL",
+    "MINI",
+    "MISSION",
+    "MM",
+    "MONITOR",
+    "Metal",
+    "Minimal",
+    "NAME",
+    "NASA FIRMS · LIVE",
+    "NAV",
+    "NEWS",
+    "NNW",
+    "NOIR",
+    "NORMAL",
+    "NVG",
+    "NW",
+    "New York",
+    "Noir",
+    "Normal",
+    "OK",
+    "ORBIT",
+    "ORBIT · ",
+    "Oldies",
+    "OpenStreetMap + optional Google Maps Places",
+    "Operator",
+    "PAUSE",
+    "PLAY",
+    "POS: LIVE",
+    "POS: {time}Z",
+    "POSITION {age}",
+    "PROJ MONITOR",
+    "Paris",
+    "Pause",
+    "Pin",
+    "Plan",
+    "Pop",
+    "Punk",
+    "RADIO",
+    "REC",
+    "REGION",
+    "RESET",
+    "Radio",
+    "Reggae",
+    "Rock",
+    "S2 GhostMaps",
+    "SAR",
+    "SIG",
+    "SNAPSHOT",
+    "SQUAWK {code} · {status}",
+    "SSW",
+    "STANDARD",
+    "START",
+    "STATION",
+    "STATUS",
+    "STATUS · ",
+    "STD",
+    "SW",
+    "SYNC",
+    "San Francisco",
+    "Scanlines",
+    "Scope",
+    "Sentinel-2",
+    "Sonar",
+    "Soul",
+    "Station",
+    "Station {id}",
+    "T minus {seconds}",
+    "TAGS · {tags}",
+    "TANKER",
+    "TEMP",
+    "Talk",
+    "Tallinn",
+    "Techno",
+    "Trance",
+    "Turboprop",
+    "UPSTREAM",
+    "Upstream HTTP {status}",
+    "Vignette",
+    "WHOT/BHOT",
+    "WIND",
+    "WNW",
+    "WSW",
+    "Washington DC",
+    "Wind",
+    "dB",
+    "feed status|live",
+    "fire behavior|Minimal",
+    "ft",
+    "hPa",
+    "km",
+    "km/h",
+    "min",
+    "mph",
+    "radio|NEWS",
+    "radio|TALK",
+    "view band|GLOBAL",
+    "{city} CCTV",
+    "{county} County",
+    "{source} HTTP {status}",
+    "{speed} kn",
+    "{type}  SPD: {speed}  HDG: {heading}",
+    "{value} KM",
+    "{value} KM DOWNRANGE",
+    "{value} KM/H",
+    "{value} KM/S",
+    "ΔN",
+    "Ⅱ PAUSE",
+    "▲ {frp} MW"
+  ],
   "es": [
     "1090 MHz",
     "978 MHz UAT",