Fix/application configuration preview style (#597)

web/i18n/lang/app-debug.en.ts

@@ -87,7 +87,7 @@ const translation = {
   },
   errorMessage: {
     nameOfKeyRequired: 'name of the key: {{key}} required',
-    valueOfVarRequired: 'Variables value can not be empty',
+    valueOfVarRequired: '{{key}} value can not be empty',
     queryRequired: 'Request text is required.',
     waitForResponse:
       'Please wait for the response to the previous message to complete.',

web/i18n/lang/app-debug.zh.ts

@@ -86,7 +86,7 @@ const translation = {
   },
   errorMessage: {
     nameOfKeyRequired: '变量 {{key}} 对应的名称必填',
-    valueOfVarRequired: '变量值必填',
+    valueOfVarRequired: '{{key}}必填',
     queryRequired: '主要文本必填',
     waitForResponse: '请等待上条信息响应完成',
     waitForBatchResponse: '请等待批量任务完成',