feat: i18n support with first translations

tests/renderer/i18n.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, it } from 'vitest';
+import {
+  translateUi,
+  resolveSupportedUiLanguage,
+  resolveUiLanguageFromSystemLocale,
+} from '../../src/renderer/i18n';
+
+describe('renderer i18n', () => {
+  it('resolves supported ui language from OS locale', () => {
+    expect(resolveUiLanguageFromSystemLocale('de-DE')).toBe('de');
+    expect(resolveUiLanguageFromSystemLocale('fr-CH')).toBe('fr');
+    expect(resolveUiLanguageFromSystemLocale('pt-BR')).toBe('en');
+  });
+
+  it('normalizes explicit ui language values', () => {
+    expect(resolveSupportedUiLanguage('it')).toBe('it');
+    expect(resolveSupportedUiLanguage('es-MX')).toBe('es');
+    expect(resolveSupportedUiLanguage('')).toBe('en');
+  });
+
+  it('returns translated text with english fallback', () => {
+    expect(translateUi('de', 'common.save')).toBe('Speichern');
+    expect(translateUi('fr', 'common.cancel')).toBe('Annuler');
+    expect(translateUi('de', 'settings.language.english')).toBe('Englisch');
+    expect(translateUi('it', 'missing.key')).toBe('missing.key');
+  });
+});

tests/renderer/i18nLocaleCompleteness.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, it } from 'vitest';
+import en from '../../src/renderer/i18n/locales/en.json';
+import de from '../../src/renderer/i18n/locales/de.json';
+import fr from '../../src/renderer/i18n/locales/fr.json';
+import itLocale from '../../src/renderer/i18n/locales/it.json';
+import es from '../../src/renderer/i18n/locales/es.json';
+
+type LocaleMap = Record<string, string>;
+
+const locales: Record<string, LocaleMap> = {
+  de: de as LocaleMap,
+  fr: fr as LocaleMap,
+  it: itLocale as LocaleMap,
+  es: es as LocaleMap,
+};
+
+describe('renderer locale completeness', () => {
+  const englishKeys = Object.keys(en as LocaleMap).sort();
+
+  it('all renderer locales contain exactly the english key set', () => {
+    for (const [locale, messages] of Object.entries(locales)) {
+      const localeKeys = Object.keys(messages).sort();
+
+      expect(localeKeys, `Locale ${locale} is missing or has extra keys`).toEqual(englishKeys);
+    }
+  });
+});

tests/renderer/menuCommands.test.ts

@@ -40,12 +40,11 @@ describe('Help menu documentation entry', () => {
     expect(viewGroup?.items.some((item) => item.action === 'toggleFullScreen')).toBe(true);
   });
 
-  it('renames generateSitemap menu item to Render Site and assigns Command/Ctrl+R', () => {
+  it('assigns Command/Ctrl+R shortcut for generateSitemap menu item', () => {
     const blogGroup = APP_MENU_GROUPS.find((group) => group.label === 'Blog');
     const generateSiteItem = blogGroup?.items.find((item) => item.action === 'generateSitemap');
 
     expect(generateSiteItem).toBeDefined();
-    expect(generateSiteItem?.label).toBe('Render Site');
     expect(generateSiteItem?.accelerator).toBe('CmdOrCtrl+R');
   });
 });