fix: Fixed pages showing up in wrong language (#1752)

* Fix languages

* Missed change for version number

* Add language field for presentation

* Revert change in README for double buffer

Co-authored-by: Jackie Nim <=>

zh/callback/README.md

@@ -2,8 +2,9 @@
 layout: pattern
 title: Callback
 folder: callback
-permalink: /patterns/callback/
+permalink: /patterns/callback/zh
 categories: Idiom
+language: zh
 tags:
  - Reactive
 ---