translate 2020 Capabilities chapter to Dutch (#1889)

* Create capabilities.md

* done translating to dutch

* Add missing escapes to allow chapter to generate

* Apply suggestions from code review

Co-authored-by: Barry Pollard <[email protected]>

* add lang="en" spans

* Apply suggestions from code review

* Update src/content/nl/2020/capabilities.md

Co-authored-by: Barry Pollard <[email protected]>