Add Turkish desktop locale (#9392)

Signed-off-by: dejavu <dejavu@Mac.home>
Co-authored-by: dejavu <dejavu@Mac.home>

ui/desktop/src/i18n/i18n.test.ts

@@ -52,6 +52,17 @@ describe('getLocale', () => {
     expect(getLocale()).toEqual({ locale: 'en-GB', messageLocale: 'en' });
   });
 
+  it('supports Turkish from navigator.languages', () => {
+    vi.stubGlobal('navigator', { languages: ['tr-TR'] });
+    expect(getLocale()).toEqual({ locale: 'tr-TR', messageLocale: 'tr' });
+  });
+
+  it('supports explicit Turkish locale', () => {
+    mockAppConfig({ GOOSE_LOCALE: 'tr' });
+    vi.stubGlobal('navigator', { languages: ['xx-XX'] });
+    expect(getLocale()).toEqual({ locale: 'tr', messageLocale: 'tr' });
+  });
+
   it('falls back to base language when locale tag is invalid BCP 47', () => {
     // "en-" is not a valid BCP 47 tag and would cause RangeError in Intl APIs
     mockAppConfig({ GOOSE_LOCALE: 'en-' });

ui/desktop/src/i18n/index.ts

@@ -15,7 +15,7 @@
 export { defineMessages, useIntl } from 'react-intl';
 
 /** The set of locales that have translation catalogs. */
-const SUPPORTED_LOCALES = new Set(['en', 'zh-CN']);
+const SUPPORTED_LOCALES = new Set(['en', 'tr', 'zh-CN']);
 
 /**
  * Map Simplified Chinese aliases (zh, zh-Hans*, zh-SG, zh-MY) to "zh-CN".