message: Add lock icon to notification link
diff: import React from 'react';
  import PropTypes from 'prop-types';
  +import { unescape } from 'underscore';
  import Text from 'react/components/UI/Text';
  import Truncate from 'react/components/UI/Truncate';
  +import LockIconWithBorder from 'react/components/UI/LockIconWithBorder';
  const NotificationObjectLink = ({
  __typename, label, href, visibility, is_me, ...rest
  @@ -25,8 +27,11 @@ const NotificationObjectLink = ({
  >
  <a href={href}>
  <Truncate length={40}>
  - {label}
  + {unescape(label)}
  </Truncate>
  + {visibility === 'private' &&
  + <LockIconWithBorder display="inline-flex" ml={2} />
  + }
  </a>
  </Text>
  );
  