[UI] Display errors as pop-ups on dashboard

Registered by Nikita Konovalov

If any operation fails, dashboard should display an error message.

It should parse response from server and there are several possible errors:

* incorrect request, it should be displayed to user as some interop error
* validation error, it should be parsed and displayed to user
* internal server error, we should display some exception id to user

Blueprint information

Status:
Complete
Approver:
Sergey Lukjanov
Priority:
High
Drafter:
Nikita Konovalov
Direction:
Approved
Assignee:
Nikita Konovalov
Definition:
Approved
Series goal:
Accepted for 0.2
Implementation:
Implemented
Milestone target:
milestone icon 0.2.1-rc1
Started by
Nikita Konovalov
Completed by
Nikita Konovalov

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