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/06-quality-assurance/advanced-node-and-express/handle-a-disconnect.md

@@ -3,6 +3,7 @@ id: 589fc831f9fc0f352b528e76
 title: 处理连接断开
 challengeType: 2
 forumTopicId: 301552
+dashedName: handle-a-disconnect
 ---
 
 # --description--
@@ -59,3 +60,10 @@ socket.on('disconnect', () => {
 
 # --solutions--
 
+```js
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
+```