Feat: Chat without KB. #5216 (#5217)

### What problem does this PR solve?
Feat: Chat without KB. #5216

### Type of change


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

web/src/locales/en.ts

@@ -420,6 +420,7 @@ This procedure will improve precision of retrieval by adding more information to
       language: 'Language',
       emptyResponse: 'Empty response',
       emptyResponseTip: `Set this as a response if no results are retrieved from the knowledge bases for your query, or leave this field blank to allow the LLM to improvise when nothing is found.`,
+      emptyResponseMessage: `Empty response will be triggered when nothing relevant is retrieved from knowledge bases. Erase 'Empty response' since none of knowledge base is selected.`,
       setAnOpener: 'Opening greeting',
       setAnOpenerInitial: `Hi! I'm your assistant, what can I do for you?`,
       setAnOpenerTip: 'Set an opening greeting for users.',

web/src/locales/zh-traditional.ts

@@ -402,6 +402,7 @@ export default {
       language: '語言',
       emptyResponse: '空回复',
       emptyResponseTip: `如果在知識庫中沒有檢索到用戶的問題，它將使用它作為答案。如果您希望 LLM 在未檢索到任何內容時提出自己的意見，請將此留空。`,
+      emptyResponseMessage: `當知識庫中沒有檢索到任何相關內容時，將觸發空響應。由於未選擇任何知識庫，因此刪除“空響應”。`,
       setAnOpener: '設置開場白',
       setAnOpenerInitial: `你好！我是你的助理，有什麼可以幫到你的嗎？`,
       setAnOpenerTip: '您想如何歡迎您的客戶？',

web/src/locales/zh.ts

@@ -419,6 +419,7 @@ General：实体和关系提取提示来自 GitHub - microsoft/graphrag：基于
       language: '语言',
       emptyResponse: '空回复',
       emptyResponseTip: `如果在知识库中没有检索到用户的问题，它将使用它作为答案。 如果您希望 LLM 在未检索到任何内容时提出自己的意见，请将此留空。`,
+      emptyResponseMessage: `当知识库中未检索到任何相关信息时，将触发空响应。由于未选择任何知识库，因此请清除“空响应”。`,
       setAnOpener: '设置开场白',
       setAnOpenerInitial: `你好！ 我是你的助理，有什么可以帮到你的吗？`,
       setAnOpenerTip: '您想如何欢迎您的客户？',