Remove workaround for adapting various error messages

[janmichek]

Context information

application version:
device:
browser:
operating system:

Steps to reproduce

go to result page and see additional logic to adapt various types of error messaging from verifier service

What is expected?

It's working as expected. Could be done with less frontend logic.
This will be a breaking change once aeternity/smart-contract-verifier#39 is resolved

What is actually happening?

There is a workaround / additional logic to adapt various error message types