Add Language Selection Configuration Item

.env.example

@@ -1,3 +1,7 @@
+# Set the language used for the chat
+# Default to English（EN）, optional in Chinese(CH)
+CHAT_LANGUAGE=EN
+
 OPENAI_API_KEY=
 
 # Update these with your pinecone details from your dashboard. 

utils/makechain.ts

@@ -2,21 +2,46 @@ import { OpenAI } from 'langchain/llms/openai';
 import { PineconeStore } from 'langchain/vectorstores/pinecone';
 import { ConversationalRetrievalQAChain } from 'langchain/chains';
 
-const CONDENSE_PROMPT = `Given the following conversation and a follow up question, rephrase the follow up question to be a standalone question.
+const PROMPT: { [key: string]: { CONDENSE_PROMPT: string; QA_PROMPT: string; } } = {
+  'CH':{
+    CONDENSE_PROMPT: `给定以下对话和后续问题，将后续问题重新表述为独立问题。
 
-Chat History:
-{chat_history}
-Follow Up Input: {question}
-Standalone question:`;
+    对话历史:
+    {chat_history}
+    后续输入: {question}
+    独立问题:`,
+    QA_PROMPT:`你是一个有用的人工智能助手。使用以下上下文来回答最后的问题。
 
-const QA_PROMPT = `You are a helpful AI assistant. Use the following pieces of context to answer the question at the end.
-If you don't know the answer, just say you don't know. DO NOT try to make up an answer.
-If the question is not related to the context, politely respond that you are tuned to only answer questions that are related to the context.
+    如果你不知道答案，就说你不知道。不要试图编造一个答案。
+
+    如果问题与上下文无关，请礼貌地回答，您将只回答与上下文相关的问题。
+
+    {context}
+
+    问题: {question}
+    markdown格式的有用答案:`
+  },
+  'EN':{
+    CONDENSE_PROMPT: `Given the following conversation and a follow up question, rephrase the follow up question to be a standalone question.
 
-{context}
+    Chat History:
+    {chat_history}
+    Follow Up Input: {question}
+    Standalone question:`,
+    QA_PROMPT:`You are a helpful AI assistant. Use the following pieces of context to answer the question at the end.
+    If you don't know the answer, just say you don't know. DO NOT try to make up an answer.
+    If the question is not related to the context, politely respond that you are tuned to only answer questions that are related to the context.
+
+    {context}
+
+    Question: {question}
+    Helpful answer in markdown:`
+  }
+}
 
-Question: {question}
-Helpful answer in markdown:`;
+const LANGUAGE:string = process.env['CHAT_LANGUAGE'] || 'EN';
+
+const { CONDENSE_PROMPT, QA_PROMPT } = PROMPT[LANGUAGE];
 
 export const makeChain = (vectorstore: PineconeStore) => {
   const model = new OpenAI({