Add explanation

app.py

@@ -15,7 +15,7 @@ load_dotenv()
 st.title("Azure Translation Tools")
 uploaded_files = st.file_uploader("Upload files to start the process", accept_multiple_files=True)
 
-# Language options
+# Define available language options with their codes and names
 langs = (
     'id - Indonesian',
     'en - English',
@@ -33,47 +33,53 @@ langs = (
     'th - Thai',
 )
 
+# Get user's language selection and extract language code and name
 lang = st.selectbox('Target language selection:', langs, key='lang')
-lang_id = lang.split()[0]
-lang_name = lang.split()[-1]
+lang_id = lang.split()[0]  # Get language code (e.g., 'en')
+lang_name = lang.split()[-1]  # Get language name (e.g., 'English')
 
 if uploaded_files:
     submit = st.button("Get Result", key='submit')
 
 if uploaded_files and submit:
-
-    # Create a zip file in memory
+    # Create an in-memory zip file to store translated documents
     zip_buffer = io.BytesIO()
     with zipfile.ZipFile(zip_buffer, 'w') as zip_file:
-        # Add progress bar
+        # Add progress bar for translation status
         progress_bar = st.progress(0)
         for idx, uploaded_file in enumerate(uploaded_files):
             file_name = uploaded_file.name
             file_content = uploaded_file.read()
 
+            # Set up Azure Translator API headers
             headers = {
                 "Ocp-Apim-Subscription-Key": os.environ["AZURE_AI_TRANSLATOR_KEY"],
             }
 
+            # Prepare file for translation
             files = {
                 "document": (file_name, file_content, "ContentType/file-extension"),
             }
 
+            # Construct API URL with target language and version
             url = f"{os.environ["AZURE_AI_ENDPOINT_URL"]}/translator/document:translate?targetLanguage={lang_id}&api-version={os.environ["AZURE_AI_API_VERSION"]}"
+            
+            # Send translation request to Azure
             response = requests.post(url, headers=headers, files=files)
             
+            # Handle translation response
             if response.status_code == 200:
-                # Add translated file to zip
+                # Add successfully translated file to zip archive
                 zip_file.writestr(f"{lang_name}-translated-{file_name}", response.content)
                 st.success(f"Successfully translated: {file_name}")
             else:
                 st.error(f"Failed to translate {file_name} with status code {response.status_code}: {response.text}")
             
-            # Update progress bar
+            # Update progress bar based on completed translations
             progress = (idx + 1) / len(uploaded_files)
             progress_bar.progress(progress)
 
-    # Allow user to download all files as zip
+    # Create download button for the zip file containing all translations
     st.download_button(
         label="Download All Translated Files",
         data=zip_buffer.getvalue(),