Load state of "Processing..." display on page refresh

[MicaiahReid]

This looks good for showing the initial feedback, but hard coding the initial state of the buttons probably isn't the best bet long-term.

Out of curiosity I ran the dashboard and went to migrate a contract. After clicking "Process" it shows "Processing...". But if you refresh the page while the transaction is still processing, it won't show that a transaction is processing - it will allow you to process or reject that same transaction again. Eventually we'd want to store this state somehow, or get it from truffle. @gnidan should I just make another issue for this?

Originally posted by @MicaiahReid in #4938 (review)