TASK: Use role label in list users/new user view if available

[lorenzulrich]

In Neos 7 (and with neos/flow-development-collection#2162), role labels were introduced. While we now have a nice table view in the "edit account" view, the role label is not displayed anywhere else.

I'm aware that Neos 7 and 8 are in maintenance-only mode, but I think we all agree that Neos 8 will be around for quite a while. I suggest the minimal change to use the role label in the user list and the "new user" view if there is one.

• [N/A] Code follows the PSR-2 coding style
• [N/A] Tests have been created, run and adjusted as needed
• The PR is created against the lowest maintained branch
• Reviewer - PR Title is brief but complete and starts with FEATURE|TASK|BUGFIX
• Reviewer - The first section explains the change briefly for change-logs
• [N/A] Reviewer - Breaking Changes are marked with !!! and have upgrade-instructions

[kitsunet]

I like it and wouldn't mind having that