[system admin] update user links (#4234)

frontend/src/pages/sys-admin/user-link.js

@@ -0,0 +1,20 @@
+import React, { Component } from 'react';
+import PropTypes from 'prop-types';
+import { Link } from '@reach/router';
+import { siteRoot } from '../../utils/constants';
+
+const propTypes = {
+  email: PropTypes.string.isRequired,
+  name: PropTypes.string.isRequired
+};
+
+class UserLink extends Component {
+
+  render() {
+    return <Link to={`${siteRoot}sys/users/${encodeURIComponent(this.props.email)}/`}>{this.props.name}</Link>;
+  }
+}
+
+UserLink.propTypes = propTypes;
+
+export default UserLink;