chore: translations were still missing

tests/renderer/components/Sidebar.i18n.test.tsx

@@ -0,0 +1,34 @@
+import React from 'react';
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { Sidebar } from '../../../src/renderer/components/Sidebar/Sidebar';
+import { useAppStore } from '../../../src/renderer/store';
+import { I18nProvider, UI_LANGUAGE_STORAGE_KEY } from '../../../src/renderer/i18n';
+
+describe('Sidebar i18n', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    localStorage.clear();
+    localStorage.setItem(UI_LANGUAGE_STORAGE_KEY, 'de');
+    (window.electronAPI.app as { getSystemLanguage?: () => Promise<string> }).getSystemLanguage = async () => 'de-DE';
+
+    useAppStore.setState({
+      activeView: 'settings',
+      sidebarVisible: true,
+      tabs: [],
+      activeTabId: null,
+    } as never);
+  });
+
+  it('renders settings navigation labels in selected UI language', async () => {
+    render(
+      <I18nProvider>
+        <Sidebar />
+      </I18nProvider>
+    );
+
+    expect(await screen.findByText('EINSTELLUNGEN')).toBeInTheDocument();
+    expect(screen.getByText('Projekt')).toBeInTheDocument();
+    expect(screen.getByText('Texteditor')).toBeInTheDocument();
+  });
+});