Add missing translations (#305)

Reviewed-on: https://gitea.com/gitea/docs/pulls/305

i18n/zh-cn/docusaurus-plugin-content-docs/version-1.25/usage/issues-prs/_category_.json

@@ -1,9 +1,9 @@
 {
-  "label": "Issues & Pull Requests",
+  "label": "工单 和 合并请求",
   "position": 20,
   "link": {
     "type": "generated-index",
     "slug": "/usage/issues-prs",
-    "description": "Issues and Pull Requests workflow, templates, and collaboration features"
+    "description": "工单 和 合并请求 工作流，模板，和协作功能"
   }
 }