Production features and text updates:
- Add 'Voor opleiders' toggle in Administration component
- Update 'Kwaliteitsstandaarden' → 'Zorgstandaarden' throughout
- Update 'Toetsing' → 'Meer leren' in translations
- Update 'Register' → 'Accreditatie' in filters
- Store integration for voor_opleiders field
These changes were made directly on production and need to be
preserved in version control.
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