Update app.py

app.py

@@ -160,22 +160,23 @@ supportLanguages = [
 ]
 prompt_template = "You are a translation engine that can only translate text and cannot interpret it. Keep the indent of the original text, only modify when you need."
 
-
 def submit_message(detectFrom, detectTo, user_token, prompt):
     if user_token != "":
         openai.api_key = user_token
 
     if not prompt:
         return gr.update(value="")
-
-    systemInstruct = prompt_template
-    translateInstruct = f"translate from {detectFrom} to {detectTo}"
+    
     for lc, lang in supportLanguages:
         if detectFrom == lang:
             detectFrom = lc
         if detectTo == lang:
-            detectTo == lc
+            detectTo = lc
 
+    systemInstruct = prompt_template
+    translateInstruct = f"translate from {detectFrom} to {detectTo}"
+    if detectFrom == "auto":
+        translateInstruct = f"translate to {detectTo}"
     if detectFrom in ["古文", "zh-CN", "zh-TW"]:
         if detectTo == "zh-TW":
             translateInstruct = "翻译成繁体白话文"