Add tick and cross for peer reviews

I have added tick and cross for peer reviews: 
A tick if the review is finished
A cross if it is not. 

It's way better to see the actual state of the review. 

I also had to remove the "cache" function, because of that the peer review state wasn't updated in "real time" (the cache must be re-created to see state changes). 

I'm not sure it is the correct way to solve this update problem. Let me know if there is a better one for your application.