Sync with reactjs.org @ 951fae39

[react-translations-bot]

This PR was automatically generated.

Merge changes from reactjs.org at 951fae39

The following files have conflicts and may need new translations:

• [ ] 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/components-and-props.md
• [ ] content/docs/conditional-rendering.md
• [ ] content/docs/create-a-new-react-app.md
• [ ] content/docs/forms.md
• [ ] content/docs/getting-started.md
• [ ] content/docs/handling-events.md
• [ ] content/docs/hello-world.md
• [ ] content/docs/hooks-intro.md
• [ ] content/docs/introducing-jsx.md
• [ ] content/docs/lifting-state-up.md
• [ ] content/docs/lists-and-keys.md
• [ ] content/docs/nav.yml
• [ ] content/docs/reference-dom-elements.md
• [ ] content/docs/reference-glossary.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/thinking-in-react.md
• [ ] content/home/examples/a-simple-component.js
• [ ] content/tutorial/tutorial.md
• [ ] examples/hello-world.js
• [ ] src/components/LayoutFooter/Footer.js
• [ ] src/components/MarkdownPage/MarkdownPage.js
• [ ] src/pages/versions.js
• [ ] src/site-constants.js
• [ ] static/html/single-file-example.html
• [ ] vercel.json
• [ ] 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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[vercel[bot]]

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