When sending a Tx:

• the user sending the Tx actually doesn't care very much about the confirmations, we should consider a Tx list showing the number of confirmations. Blocking the UI at this stage doesn't bring much. Linked to Be able to see the past transactions #98

When waiting for peers:
- the little green dot should be present on all pages and turn orange with the message "connecting to the blockchain" or something
edit: done in #216