change m2m target language setup

app.py

@@ -179,10 +179,10 @@ def mbart_trans(article, target_language):
 def m2m_trans(article, target_language):
     result_lang = detect_lang(article)
     if target_language == "English":
-        target_language = "en"
+        target_lang = "en"
     elif target_language == "Chinese":
-        target_language = "zh"
-    if result_lang != target_language:
+        target_lang = "zh"
+    if result_lang != target_lang:
         if target_language == "English":
             return m2m_model.translate(article, target_lang="en")
         elif target_language == "Chinese":