minor fixes for language and removing OPUS model

app.py

@@ -166,8 +166,12 @@ def nllb_trans(article, target_language):
 
 def mbart_trans(article, target_language):
     result_lang = detect_lang(article)
+    if target_language == "English":
+        target_lang = "en"
+    elif target_language == "Chinese":
+        target_lang = "zh"
 
-    if result_lang != target_language:
+    if result_lang != target_lang:
         if target_language == "English":
             return mbart_m2en_model.translate(article, target_lang="en")
         else:
@@ -184,17 +188,17 @@ def m2m_trans(article, target_language):
         target_lang = "zh"
     if result_lang != target_lang:
         if target_language == "English":
-            return m2m_model.translate(article, target_lang="en")
+            return m2m_model.translate(article, target_lang)
         elif target_language == "Chinese":
-            return m2m_model.translate(article, target_lang="zh")
+            return m2m_model.translate(article, target_lang)
     else:
         return "Error: You chose the same language as the article detected language. Please reselect language and try again."
 
 
 def translate(article, toolkit, target_language):
-    if toolkit == "OPUS":
-        translated = opus_trans(article, target_language)
-    elif toolkit == "NLLB":
+    # if toolkit == "OPUS":
+    #     translated = opus_trans(article, target_language)
+    if toolkit == "NLLB":
         translated = nllb_trans(article, target_language)
     elif toolkit == "MBART":
         translated = mbart_trans(article, target_language)
@@ -209,7 +213,7 @@ myTheme = myTheme()
 with gr.Blocks(theme=myTheme) as demo:
     article = gr.Textbox(label="Article")
     toolkit_select = gr.Radio(
-        ["OPUS", "NLLB", "MBART", "M2M"], label="Select Translation Model", value="OPUS"
+        ["NLLB", "MBART", "M2M"], label="Select Translation Model", value="OPUS"
     )
     lang_select = gr.Radio(["English", "Chinese"], label="Select Desired Language")
     result = gr.Textbox(label="Translated Result")