Description of problem:
There is disunity in errors and warnings representation. See Steps to Reproduce.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. When you try to create new plugin with incorrect name, inline error is displayed.
2. When you try to rename or copy plugin to incorrect name, browser allert is displayed.
3. When you try to rename or copy plugin to existing name, modal dialog error is displayed.
Similar errors and warning have disunited representation.
Similar errors and warning should have united representation.
Still appear in 6.2.0.ER3.
Also when you try to rename or copy plugin to existing name, modal dialog error is displayed and it contains exception:
Unable to complete your request. The following exception occurred: org.uberfire.java.nio.file.FileAlreadyExistsException.
It should contain some "human readable" warning.