bug fixed now... not done...

pages/main.py

@@ -57,24 +57,17 @@ def load_ui_language(file_path: Optional[str] = "ui_lang_support.json") -> Dict[
         print(f"{get_translation('erreur_lecture_fichier')} {e}")
         return {}
 
-# Dictionary to store translations
-translations = load_ui_language()
+
 
 def get_translation(key: str) -> str:
     """
     Obtient la traduction pour une clé donnée basée sur la langue d'interface sélectionnée.
-
-    Args:
-        key (str): La clé de traduction.
-
-    Returns:
-        str: Le texte traduit.
     """
-    if "interface_language" in st.session_state:
-        return translations[st.session_state.interface_language][key]
-    else:
-        return translations[st.session_state.interface_language_select][key]
-        
+    lang = st.session_state.get('interface_language', 'English')
+    return translations.get(lang, {}).get(key, key)
+
+# Dictionary to store translations
+translations = load_ui_language()   
 
 # OpenAI client configuration with API key
 client = OpenAI(api_key=getenv("OPENAI_API_KEY"))
@@ -533,17 +526,23 @@ def on_languages_change() -> None:
     ]
 
 
-def init_process_mode() -> Tuple[str, str]:
+def init_process_mode(
+        from_lang: str,
+        to_lang: str,
+        process_mode: Optional[str|list] = "translator"
+) -> Tuple[str, str]:
     """
     Initialise le mode de traitement pour la traduction si nécessaire.
 
     Returns:
         Tuple[str, str]: Un tuple contenant le prompt système et le prompt d'opération.
     """
-    if st.session_state["process_mode"] == "translation":
+    # from  (e.g.: st.session_state.language_detected)
+    # dest  (e.g.: st.session_state.target_language)
+    if "translator" in process_mode:
         system_prompt, operation_prompt = set_translation_mode(
-            from_lang=st.session_state.language_detected,
-            dest_lang=st.session_state.target_language
+            from_lang=f"{from_lang}",
+            dest_lang=f"{to_lang}"
         )
         return system_prompt, operation_prompt
     return "", ""
@@ -573,7 +572,7 @@ def main_page():
     if "interface_language_select" not in st.session_state:
         st.session_state.interface_language_select = "English"  # Langue par défaut
 
-    system_prompt, operation_prompt = init_process_mode()
+    #system_prompt, operation_prompt = init_process_mode()
 
     # Initialisation de l'historique des messages avec le prompt système
     if "messages" not in st.session_state:
@@ -598,12 +597,27 @@ def main_page():
 
         for cursor_selected_lang in st.session_state.selected_languages:
             st.session_state.target_language = cursor_selected_lang["iso-639-1"]
+            target_language_name = cursor_selected_lang["language"]
+
             # Réinitialiser les messages avant de traiter une nouvelle entrée
             st.session_state.messages = []
             st.session_state.full_response = "" 
+            
             # Initialisation du mode de traitement pour la langue cible actuelle
-            system_prompt, operation_prompt = init_process_mode()
-            target_language_name = cursor_selected_lang["language"]
+            system_prompt, operation_prompt = init_process_mode(from_lang=
+                (
+                    st.session_state.language_detected if "language_detected" in st.session_state.language_detected else convert_language_name_to_iso6391( 
+                        st.session_state.interface_language 
+                    )
+                ), 
+                to_lang=st.session_state.target_language 
+            )
+            # display error with st.error ; if (system_prompt, operation_prompt) is "", "" or None, None, and raise error 
+            if not system_prompt or not operation_prompt:
+                st.error("Erreur : Les prompts système ou d'opération sont vides.")
+                raise ValueError("Les prompts système ou d'opération ne peuvent pas être vides.")
+            
+            
             with st.status(f'({target_language_name}) - {get_translation("traduction_en_cours")}', expanded=True) as response_status:
                 with st.chat_message("assistant", avatar="👻"):
                     message_placeholder = st.empty()
@@ -735,8 +749,17 @@ def main_page():
                 for cursor_selected_lang in st.session_state.selected_languages:
                     st.session_state.target_language = cursor_selected_lang["iso-639-1"]
                     st.session_state.full_response = ""
+
                     # Initialisation du mode de traitement pour la langue cible actuelle
-                    system_prompt, operation_prompt = init_process_mode()
+                    system_prompt, operation_prompt = init_process_mode(from_lang=
+                        (
+                            st.session_state.language_detected if "language_detected" in st.session_state.language_detected else convert_language_name_to_iso6391( 
+                                st.session_state.interface_language 
+                            )
+                        ), 
+                        to_lang=st.session_state.target_language 
+                    )
+
                     with st.chat_message("assistant", avatar="👻"):
                         message_placeholder = st.empty()
                         response_generator = process_message(