Sync with reactjs.org @ 1a641bb8

[react-translations-bot]

This PR was automatically generated.

Merge changes from reactjs.org at 1a641bb8

The following files have conflicts and may need new translations:

• [ ] content/community/conferences.md
• [ ] content/community/courses.md
• [ ] content/community/meetups.md
• [ ] content/community/support.md
• [ ] content/docs/accessibility.md
• [ ] content/docs/add-react-to-a-website.md
• [ ] content/docs/addons-shallow-renderer.md
• [ ] content/docs/addons-test-utils.md
• [ ] content/docs/cdn-links.md
• [ ] content/docs/code-splitting.md
• [ ] content/docs/codebase-overview.md
• [ ] content/docs/components-and-props.md
• [ ] content/docs/composition-vs-inheritance.md
• [ ] content/docs/concurrent-mode-adoption.md
• [ ] content/docs/concurrent-mode-reference.md
• [ ] content/docs/concurrent-mode-suspense.md
• [ ] content/docs/create-a-new-react-app.md
• [ ] content/docs/error-boundaries.md
• [ ] content/docs/faq-functions.md
• [ ] content/docs/faq-styling.md
• [ ] content/docs/forms.md
• [ ] content/docs/handling-events.md
• [ ] content/docs/hello-world.md
• [ ] content/docs/hooks-faq.md
• [ ] content/docs/hooks-intro.md
• [ ] content/docs/hooks-reference.md
• [ ] content/docs/how-to-contribute.md
• [ ] content/docs/integrating-with-other-libraries.md
• [ ] content/docs/jsx-in-depth.md
• [ ] content/docs/lists-and-keys.md
• [ ] content/docs/nav.yml
• [ ] content/docs/react-without-es6.md
• [ ] content/docs/reconciliation.md
• [ ] content/docs/reference-dom-elements.md
• [ ] content/docs/reference-javascript-environment-requirements.md
• [ ] content/docs/reference-react-component.md
• [ ] content/docs/reference-react-dom-server.md
• [ ] content/docs/reference-react-dom.md
• [ ] content/docs/reference-react.md
• [ ] content/docs/rendering-elements.md
• [ ] content/docs/state-and-lifecycle.md
• [ ] content/docs/strict-mode.md
• [ ] content/docs/testing-environments.md
• [ ] content/docs/testing-recipes.md
• [ ] content/docs/thinking-in-react.md
• [ ] content/docs/typechecking-with-proptypes.md
• [ ] content/home/examples/a-simple-component.js
• [ ] content/tutorial/tutorial.md
• [ ] content/warnings/invalid-aria-prop.md
• [ ] content/warnings/unknown-prop.md
• [ ] src/components/LayoutFooter/Footer.js
• [ ] src/pages/versions.js
• [ ] yarn.lock

Please fix the conflicts by pushing new commits to this pull request, either by editing the files directly on GitHub or by checking out this branch.

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