Sync with upstream @ ea7738bb

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This PR was automatically generated to merge changes from en.javascript.info at ea7738bb

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- [ ] [1-js/01-getting-started/1-intro/article.md](/javascript-tutorial/en.javascript.info/commits/master/1-js/01-getting-started/1-intro/article.md) - [ ] [1-js/01-getting-started/2-manuals-specifications/article.md](/javascript-tutorial/en.javascript.info/commits/master/1-js/01-getting-started/2-manuals-specifications/article.md) - [ ] [1-js/01-getting-started/3-code-editors/article.md](/javascript-tutorial/en.javascript.info/commits/master/1-js/01-getting-started/3-code-editors/article.md) - [ ] [1-js/02-first-steps/01-hello-world/article.md](/javascript-tutorial/en.javascript.info/commits/master/1-js/02-first-steps/01-hello-world/article.md) - [ ] [1-js/02-first-steps/02-structure/article.md](/javascript-tutorial/en.javascript.info/commits/master/1-js/02-first-steps/02-structure/article.md) - [ ] [1-js/02-first-steps/04-variables/2-declare-variables/solution.md](/javascript-tutorial/en.javascript.info/commits/master/1-js/02-first-steps/04-variables/2-declare-variables/solution.md) - 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[ ] [README.md](/javascript-tutorial/en.javascript.info/commits/master/README.md) - [ ] [figures.sketch](/javascript-tutorial/en.javascript.info/commits/master/figures.sketch)

To merge changes manually (instead of merging this PR):

1. Add remote upstream that links to the English version (only needs to be done once)
   • git add remote upstream https://github.com/javascript-tutorial/en.javascript.info
2. Commit all current work locally and git checkout master
3. Pull the recent changes from the English version:
   • git pull upstream master
4. Deal with the conflicts. If a conflict touches a few lines, then just fix it. Otherwise, following commands can help:
   • Checkout your (translated) version of a file/folder at the given path (removes all upstream changes):
     • git checkout --ours <path>
   • See the diff, what changed in the upstream file since branches diverged:
     • git diff --word-diff master...upstream/master <path> (please note: three dots in the command)
   • Then you can examine the changes in upstream and add them manually
5. When conflicts resolved, commit them and git push origin master

Please ignore changes in README.md (git checkout --ours README.md && git commit -m ignore README.md).

This PR will be closed and replaced with a new one in a few days.

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Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
6 out of 13 committers have signed the CLA.

:white_check_mark: joaquinelio
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:white_check_mark: leviding
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:white_check_mark: iliakan
:white_check_mark: Violet-Bora-Lee
:x: Rnbsov
:x: nikolai-chernolutskii
:x: alagunoff
:x: cerealexperiments
:x: orelby
:x: Victor-Nikliaiev
:x: a-v-gor
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