[OAuth] Twitter connector validation unreadable error message

(Migrated from https://github.com/syndesisio/syndesis/issues/6036)

Author: @mcada
Assignees: unassigned

This is a...

[pre][code]
[ ] Feature request
[ ] Regression (a behavior that used to work and stopped working in a new release)
[x] Bug report [!-- Please search GitHub for a similar issue or PR before submitting --]
[ ] Documentation issue or request
[/code][/pre]

Description

As a citizen integrator there is no way I can understand following error message:

!screenshot_20190702_141312

The message appears when I try to create twitter connector with invalid credentials.