fix(i18n): drop the duplicate ZH_CN "Idle" key

The Approvals Inbox strings added a second `Idle: '空闲'` to the ZH_CN
table, beside the original in the status words. Same value, so nothing
changed on screen, but every build warned:

  [WARNING] Duplicate key "Idle" in object literal [duplicate-object-key]

src/web/public/i18n.js

@@ -579,7 +579,6 @@
     Send: '发送',
     Permission: '权限',
     Question: '问题',
-    Idle: '空闲',
     'Read My Mind': '读心术',
     'Read My Mind: predict your next prompt': '读心术：预测您的下一条提示',
     'Predict my next prompt': '预测我的下一条提示',