fix: update QA document default language from "Chinese" to "Chinese Simplified" (#17541)

web/app/components/datasets/create/step-two/index.tsx

@@ -211,7 +211,7 @@ const StepTwo = ({
   }
 
   const [docLanguage, setDocLanguage] = useState<string>(
-    (datasetId && documentDetail) ? documentDetail.doc_language : (locale !== LanguagesSupported[1] ? 'English' : 'Chinese'),
+    (datasetId && documentDetail) ? documentDetail.doc_language : (locale !== LanguagesSupported[1] ? 'English' : 'Chinese Simplified'),
   )
 
   const [parentChildConfig, setParentChildConfig] = useState<ParentChildConfig>(defaultParentChildConfig)