feat(curriculum): restore seed + solution to Chinese (#40683)

* feat(tools): add seed/solution restore script

* chore(curriculum): remove empty sections' markers

* chore(curriculum): add seed + solution to Chinese

* chore: remove old formatter

* fix: update getChallenges

parse translated challenges separately, without reference to the source

* chore(curriculum): add dashedName to English

* chore(curriculum): add dashedName to Chinese

* refactor: remove unused challenge property 'name'

* fix: relax dashedName requirement

* fix: stray tag

Remove stray `pre` tag from challenge file.

Signed-off-by: nhcarrigan <nhcarrigan@gmail.com>

Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>

curriculum/challenges/chinese/01-responsive-web-design/basic-css/style-the-html-body-element.md

@@ -4,6 +4,7 @@ title: 给 HTML 的 body 元素添加样式
 challengeType: 0
 videoUrl: 'https://scrimba.com/c/cB77PHW'
 forumTopicId: 18313
+dashedName: style-the-html-body-element
 ---
 
 # --description--
@@ -48,5 +49,22 @@ assert(
 );
 ```
 
+# --seed--
+
+## --seed-contents--
+
+```html
+<style>
+
+</style>
+```
+
 # --solutions--
 
+```html
+<style>
+body {
+  background-color: black;
+}
+</style>
+```