[bisq-network/bisq] Add mediation support (#3221)

[Christoph Atteneder]

<img width="1312" alt="Bildschirmfoto 2019-09-11 um 21 16 40" src="https://user-images.githubusercontent.com/170962/64727597-7a846700-d4d9-11e9-9b21-81a75f10da18.png">
After accepting or rejecting a mediation the button still shows `Accept or Reject`. It should be greyed out with `You have accepted` or `You have rejected`

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