Improve sidebar menu item and title for error logs
Improve sidebar menu item and title for error logs

improves PR #629

cc @andypetrella @huitseeker

andypetrella/spark-notebook,radek1st/spark-notebook,0asa/spark-notebook,antonkulaga/spark-notebook,andypetrella/spark-notebook,antonkulaga/spark-notebook,radek1st/spark-notebook,spark-notebook/spark-notebook,spark-notebook/spark-notebook,andypetrella/spark-notebook,maasg/spark-notebook,0asa/spark-notebook,andypetrella/spark-notebook,antonkulaga/spark-notebook,antonkulaga/spark-notebook,radek1st/spark-notebook,0asa/spark-notebook,maasg/spark-notebook,spark-notebook/spark-notebook,spark-notebook/spark-notebook,maasg/spark-notebook,0asa/spark-notebook,radek1st/spark-notebook,maasg/spark-notebook