Merge remote-tracking branch 'origin/main' into german/hal-639-de

# Conflicts:
#	docs/CURRENT-STATE.md
#	docs/TRANSLATORS.md
#	src/i18n/i18n.test.mjs
#	src/i18n/index.js
#	src/i18n/locale.js
#	src/layers/cyclones/source.js
#	src/scenes/recipes.js
#	src/scenes/sceneTitleDisplay.test.mjs
#	src/ui/localePicker.test.mjs

src/i18n/i18n.test.mjs

@@ -33,11 +33,20 @@ 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('de'), 'de');
   assert.equal(normalizeLocale('de-AT'), 'de');
   assert.equal(normalizeLocale('de_CH'), 'de');
+  assert.equal(normalizeLocale('fr'), 'fr');
+  assert.equal(normalizeLocale('fr-CA'), 'fr');
+  assert.equal(normalizeLocale('FR_be'), 'fr');
+  assert.equal(normalizeLocale('pt-BR'), 'pt');
+  assert.equal(normalizeLocale('pt_PT'), 'pt');
   assert.equal(normalizeLocale('xx'), null);
+  assert.equal(normalizeLocale('it-IT'), 'it');
+  assert.equal(normalizeLocale('it_CH'), 'it');
   // Explicit script tags take precedence over regional defaults.
   assert.equal(normalizeLocale('zh'), 'zh-CN');
   assert.equal(normalizeLocale('zh-CN'), 'zh-CN');
@@ -153,6 +162,36 @@ 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('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');
@@ -211,6 +250,21 @@ test('applyDocumentTranslations translates opted-in text and attributes in place
   assert.equal(unknown.textContent, 'No such message');
 });
 
+test('applyDocumentTranslations reads data-i18n-context for element text', () => {
+  const option = fakeElement({
+    text: 'All',
+    attributes: { 'data-i18n-context': 'radio tag' },
+  });
+  const doc = {
+    querySelectorAll: (selector) =>
+      selector === '[data-i18n]' ? [option] : [],
+  };
+  setLocale('pt');
+  applyDocumentTranslations(doc);
+  assert.equal(option.textContent, t('All', { context: 'radio tag' }));
+  assert.notEqual(option.textContent, t('All'));
+});
+
 test('persistLocaleAndReload keeps the choice in ?lang when storage is blocked', () => {
   const calls = [];
   const location = {