Change error message for old _users validation

html/typo3conf/ext/t3omy/Classes/Domain/Validator/ServersideValidator.php

@@ -165,7 +165,7 @@ class ServersideValidator extends \In2code\Femanager\Domain\Validator\Serverside
             ->fetchColumn(0);
 
         if ($usernameExists) {
-            $this->addError(ucfirst($fieldName) . ' is not available.', $fieldName);
+            $this->addError(ucfirst($fieldName) . ' is blocked.', $fieldName);
             $this->isValid = false;
         }
     }