fix error one language

main.py

@@ -137,11 +137,16 @@ def create_translation_files(temp_dir: str, output_dir: str, filename: str, lang
     }
 
 @app.post('/upload')
-async def upload_file(sbv_file: UploadFile, languages: list[str]):
+async def upload_file(request: Request, sbv_file: UploadFile):
     content = await sbv_file.read()
     
-    if isinstance(languages, str):
-        languages = [languages]
+    # Get form data
+    form = await request.form()
+    languages = form.getlist('languages')
+
+    # Ensure languages is always a list
+    if not languages:
+        return PlainTextResponse("Please select at least one language for translation.", status_code=400)
 
     result = translate_and_process_sbv(content, sbv_file.filename, languages)