$form['clean'] = [
'#type' => 'fieldset',
'#title' => $this->t('Clean test environment'),
- '#description' => $this->t('Remove tables with the prefix "simpletest" and temporary directories that are left over from tests that crashed. This is intended for developers when creating tests.'),
+ '#description' => $this->t('Remove tables with the prefix "test" followed by digits and temporary directories that are left over from tests that crashed. This is intended for developers when creating tests.'),
'#weight' => 200,
];
$form['clean']['op'] = [