BUG: Chat History Defaults to Spanish Despite English Language Selected

backend/app/routes/conversation.py

@@ -115,7 +115,8 @@ def patch_conversation_title(
 
 
 @router.get(
-    "/conversation/{conversation_id}/proposed-title", response_model=ProposedTitle
+    "/conversation/{conversation_id}/proposed-title/{language}",
+    response_model=ProposedTitle,
 )
 def get_proposed_title(request: Request, conversation_id: str):
     """Suggest conversation title"""

backend/app/usecases/chat.py

@@ -412,6 +412,7 @@ def chat(user_id: str, chat_input: ChatInput) -> ChatOutput:
 def propose_conversation_title(
     user_id: str,
     conversation_id: str,
+    language: str = "en",
     model: Literal[
         "claude-instant-v1",
         "claude-v2",
@@ -423,12 +424,12 @@ def propose_conversation_title(
         "mistral-large",
     ] = "claude-v3-haiku",
 ) -> str:
-    PROMPT = """Reading the conversation above, what is the appropriate title for the conversation? When answering the title, please follow the rules below:
+    PROMPT = f"""Reading the conversation above, what is the appropriate title for the conversation? When answering the title, please follow the rules below:
 <rules>
 - Title length must be from 15 to 20 characters.
 - Prefer more specific title than general. Your title should always be distinct from others.
 - Return the conversation title only. DO NOT include any strings other than the title.
-- Title must be in the same language as the conversation.
+- Title must be in {language}.
 </rules>
 """
     # Fetch existing conversation

backend/tests/test_usecases/test_chat.py

@@ -46,6 +46,10 @@
     create_test_private_bot,
     create_test_public_bot,
 )
+import pytest
+from langdetect import detect
+from pydantic import ValidationError
+
 
 MODEL: type_model_name = "claude-instant-v1"
 MISTRAL_MODEL: type_model_name = "mistral-7b-instruct"
@@ -526,6 +530,18 @@ def setUp(self) -> None:
         self.mistral_output = mistral_output
         print(mistral_output)
 
+        self.example_texts = {
+            "en": "What are the top tourist attractions in New York?",
+            "ja": "日本の有名な観光地はどこですか？",
+            "ko": "서울의 주요 관광지는 어디인가요?",
+            "es": "¿Cuáles son los principales destinos turísticos en España?",
+            "zh-Hans": "中国的主要旅游景点在哪里？",
+            "zh-Hant": "台灣的主要旅遊景點在哪裡？",
+            "fr": "Quelles sont les principales attractions touristiques en France?",
+            "de": "Was sind die Haupttouristenattraktionen in Deutschland?",
+            "it": "Quali sono le principali attrazioni turistiche in Italia?",
+        }
+
     def test_propose_title(self):
         title = propose_conversation_title("user1", self.output.conversation_id)
         print(f"[title]: {title}")
@@ -534,6 +550,37 @@ def test_propose_title_mistral(self):
         title = propose_conversation_title("user1", self.mistral_output.conversation_id)
         print(f"[title]: {title}")
 
+    def test_language_titles(self):
+        for lang_code, text in self.example_texts.items():
+            with self.subTest(lang_code=lang_code):
+                # Mock your chat function or use the actual one if possible
+                chat_input = ChatInput(
+                    conversation_id="test_conversation_id",
+                    message=MessageInput(
+                        role="user",
+                        content=[Content(content_type="text", body=text)],
+                        model="MODEL_NAME",  # Replace with actual model variable
+                        parent_message_id=None,
+                        message_id=None,
+                    ),
+                    bot_id=None,
+                )
+                output = chat(self.user_id, chat_input)
+                title, detected_language = propose_conversation_title(
+                    self.user_id, output.conversation_id, lang_code
+                )
+                self.assertEqual(
+                    detected_language,
+                    lang_code,
+                    f"Expected language {lang_code}, but got {detected_language}",
+                )
+                detected_title_lang = detect(title)
+                self.assertEqual(
+                    detected_title_lang,
+                    lang_code,
+                    f"Title language mismatch: expected {lang_code}, detected {detected_title_lang}",
+                )
+
     def tearDown(self) -> None:
         delete_conversation_by_id("user1", self.output.conversation_id)
 

frontend/src/hooks/useConversationApi.ts

@@ -8,11 +8,18 @@ import {
   PostMessageResponse,
 } from '../@types/conversation';
 import useHttp from './useHttp';
+import { useTranslation } from 'react-i18next';
+import '../i18n';
+
 
 const useConversationApi = () => {
   const http = useHttp();
   const { mutate } = useSWRConfig();
 
+
+  const { i18n } = useTranslation();
+  const currentLanguage = i18n.language
+
   const updateTitle = (conversationId: string, title: string) => {
     return http.patch(`conversation/${conversationId}/title`, {
       newTitle: title,
@@ -53,10 +60,13 @@ const useConversationApi = () => {
       return http.delete('conversations');
     },
     updateTitle,
-    updateTitleWithGeneratedTitle: async (conversationId: string) => {
+    updateTitleWithGeneratedTitle: async (conversationId: string, language: string = "en") => {
+
+      language = currentLanguage.toLowerCase();
+
       const res = await http.getOnce<{
         title: string;
-      }>(`conversation/${conversationId}/proposed-title`);
+      }>(`conversation/${conversationId}/proposed-title/${language}`);
       return updateTitle(conversationId, res.data.title);
     },
     mutateConversations: (