Feat: Add insert variable icon in the header of prompt editor. #4764 (#5142)

### What problem does this PR solve?

Feat: Add insert variable icon in the header of prompt editor. #4764

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/locales/zh-traditional.ts

@@ -1111,6 +1111,7 @@ export default {
       addCategory: '新增分類',
       categoryName: '分類名稱',
       nextStep: '下一步',
+      insertVariableTip: `輸入 / 插入變數`,
     },
     footer: {
       profile: '“保留所有權利 @ react”',