[fix] convert query to string to produce valid filename for csv output

searx/webapp.py

@@ -643,7 +643,7 @@ def index():
             csv.writerow([row.get(key, '') for key in keys])
         csv.stream.seek(0)
         response = Response(csv.stream.read(), mimetype='application/csv')
-        cont_disp = 'attachment;Filename=searx_-_{0}.csv'.format(search_query.query)
+        cont_disp = 'attachment;Filename=searx_-_{0}.csv'.format(search_query.query.decode('utf-8'))
         response.headers.add('Content-Disposition', cont_disp)
         return response
     elif output_format == 'rss':