Update tests to reflect OAuth 2.0 and i18n features

- Replaced outdated assertions with updated content for 'OAuth 2.0 + i18n Ready' across HeroSection, Key Features, and E2E tests.
- Updated TechStack tests to validate inclusion of `next-intl` and `pytest`.
- Refined badge and feature test cases to align with OAuth and internationalization updates.

frontend/tests/components/home/HeroSection.test.tsx

@@ -47,7 +47,7 @@ describe('HeroSection', () => {
     );
 
     expect(screen.getByText('MIT Licensed')).toBeInTheDocument();
-    expect(screen.getByText('Comprehensive Tests')).toBeInTheDocument();
+    expect(screen.getByText('OAuth 2.0 + i18n')).toBeInTheDocument();
     expect(screen.getByText('Pragmatic by Design')).toBeInTheDocument();
   });