- Update [slug]/page.tsx to always include locale in canonical URL
- Update by-oil/page.tsx to use consistent locale prefix
- Update by-concern/page.tsx to use consistent locale prefix
- All canonical URLs now match actual URLs: /{locale}/solutions/{slug}
- Add 10 oil-for-concern solution pages with localized slugs
- Support 4 languages: sr, en, de, fr with proper canonical URLs
- Add solutions hub, by-concern, and by-oil directory pages
- Filter bundle products from solutions pages
- Add hideLangSwitcher prop to Header component
- Update translations for all languages
- Fix canonical URLs to include locale prefix