TODO integrate following email notifications

[0xlyd]

Document: https://docs.google.com/spreadsheets/d/1tDdrUMMpCbMDI4yNhx-49CRBVpwU079RYZsVHfbsJn8/edit#gid=0 (shared with Marco's email)

[frugge]

@lucaydaniel
There is some issues you should review relative to emails text:

• decide if and in which way we should change email text, title and subject when user have to pay 0 jur to sign contract;
• create an e-mail in case of "reject option" is the winner of a dispute;
• when a user lost a dispute, the losing part may withdraw it's "party payout" when the dispute proposal have funds withdrawable for both contract parties;
• at the end of a dispute winning/losing user can withdraw it's "party payout" amount immediately and not only after 24 hours