1. Only show 3 topics while 5 in db, the other 2 should show but be marked as 'not in kafka', add 'new topic' button.
2. TTL -> TTL (days)
3. replacing the setting cog, double clicking at the row should do. 
4. gray is not light enough
5. HDFS logo solid
6. Success updated -> Successfully updated.
7. Success inserted -> Successfully updated.
8. can delete a topic
9. topic edit box, 'ID extraction' field should be wider