Show who pressed the button

[tatey]

Originally we assumed that only the person who was assigned the task would press the button. Sometimes other people push the button (Eg: Someone is away today). It would be nice to give visibility to the person who pushed the button VS the person the task was assigned to.

• Accept can only be accepted by the who was assigned the task. If accepted the status should become "Accepted by @tatey".
• Reassign and archive can be pushed by anyone. If reassigned or archived the status should become "(Reassigned|Accepted) by @tatey".