Remove the fixed language code and replace it with a recommendation,

Problem/Motivation

Remove the fixed language code and replace it with a recommendation, which can include more, such as zh, zh-cn, zh-tw,zh-HK,zh-hans,zh-hant
You can kindly prompt a language code community for translation completion ratio.
Because the program should not be associated with the language generation, by the user's free choice, rather than the community fixed.

Reasons please see the question:
https://www.drupal.org/project/drupal/issues/3111571 🐛 Except for websites created by Drupal, no websites use "zh-hans" and "zh-hant" language codes. Active