Add "back to menu button"

When you click play or spectate, there needs to be a "back to menu" button. It's just really convenient and pretty much neccessary now that there's the spectating option. 

It's really annoying when I click watch, but there are no battles, so I have to reload the page to go back to the menu. This would be a very simple thing to add and there's no reason why not to implement it.

-Storm Crow