Set up for Simplified Chinese translations

I want to start the process for translating the User Guide to Simplified Chinese. I translated a lot for the Drupal Console Documentation to Simplified Chinese as the maintainer.

This issue is to track progress on setting up for translations into Simplified Chinese.

First things first, let me Explaining why I choose ZH-HANS as the LANGCODE, not two letters ZH in lower-case asked in the Guide. In the current source code of Drupal Core, below is the line 332 to 333 of the Core/Language/LanguageManager.php

'zh-hans' => array('Chinese, Simplified', '简体中文'),
'zh-hant' => array('Chinese, Traditional', '繁體中文')

The line 332 defined the langcode for our language, and the next line is for another language called Traditional Chinese. If we choose two letters ZH, what langcode for the Traditional Chinese.

Tasks

1. [DONE] Add a new issue component for translations into this new language, by editing the Project page. The component should be called "ZH-HANS translation".
2. [DONE] Make a new source/zh-hans directory. Copy all of the source (English) files, including the images subdirectory, into the new directory. Keep the file names and IDs the same as they were in English.
3. [DONE] Add a new section to the attributions.txt file for the translation team management for this language. Template:
   

   ==== Translation into Simplified Chinese
   
   The Simplified Chinese translation of this guide was coordinated by:
   
   * https://www.drupal.org/u/person1[Person One]
   
   * https://www.drupal.org/u/person2[Person Two] of http://example.com[Company]
   

4. [DONE] - Make a separate issue for the screenshots. See Guidelines document for issue template. See #2830624: [ZH-HANS] Simplified Chinese screenshots
5. [DONE] Grant issue maintainer and VCS commit permissions to the manager or managers of the language team for the new language, by editing the Maintainers page for the project.
6. [DONE] Make issues for translating each topic into the target language. There is a spreadsheet file scripts/bookmarks.fods that will aid in doing this.
7. [DONE] Copy the English configuration file scripts/lang-en.conf to file name lang-lc.conf, where lc is the language code.
8. [DONE] Add notes to the guide.txt #2832681: [ZH-HANS] 翻译文件: guide.txt and glossary.txt #2832784: [ZH-HANS] 翻译文件: glossary.txt file translation issues: When the chapter headers for the Preface, Index, and Glossary sections are translated, the scripts/lang-lc.conf file translations of these same 3 words need to be done at the same time. Suggested note:
   

   When this translation is done, make sure to update the scripts/lang-lc.conf (for your language code) at the same time so the chapter headings for Preface, Index, and Glossary in that file match what is in the source file for this issue.
   

9. [DONE] Add langcode to the build scripts in scripts/languages.txt, and verify that it builds without errors.
10. Optional but recommended steps:
    • Make a translation glossary for this language. File scripts/TermsToTranslate.fods is a good starting point. This should be located in a place that the language team normally uses for communication, such as on localize.drupal.org. See https://localize.drupal.org/node/64075#terms
    • Make a shared spreadsheet (for example, using Google Sheets) to track translation progress. File scripts/bare_topic_names.csv is a good starting point; you can add columns for the issue URLs, and status of each issue. #2833901: [ZH-HANS] tracking translation progress
11. Start translating!