message: [PF4] Login page - error massage has a 'danger' literal at the end of the sentence
diff: @@ -135,13 +135,15 @@ export default class LoginPage extends React.Component<LoginProps, LoginState> {
  }
  if (authenticationConfig.secretMissing) {
  messages.push(
  + this.renderMessage(
  'The Kiali secret is missing. Users are prohibited from accessing Kiali until an administrator \
  creates a valid secret. Please refer to the Kiali documentation for more details.',
  'danger'
  + )
  );
  }
  if (this.props.status === LoginStatus.expired) {
  - messages.push('Your session has expired or was terminated in another window.', 'warning');
  + messages.push(this.renderMessage('Your session has expired or was terminated in another window.', 'warning'));
  }
  if (!authenticationConfig.secretMissing && this.props.status === LoginStatus.error) {
  messages.push(this.props.message);
  