Incorrect text when saving user whose name already exists

[osmers]

Describe the Bug

When creating a user whose name already exists, the system still displays the message that the activation of the account is outstanding - which is incorrect, since the account was never created

Steps to Reproduce

1. Go to 'Any region'
2. Click on 'users'
3. Click on "create new user"
4. Choose a username that already exists
5. Choose "send activation link"
6. Press save.
7. See erroneous message - activation outstanding

Expected Behavior

The message should only read "user name already exists"

Actual Behavior

There is an additional message that the activation is still outstanding.

Additional Information