Look in the source of the specific portal configuration page, in this case portal-web/docroot/html/portlet/portal_settings/email_notifications.jsp:
1String adminEmailUserAddedSubject = PrefsPropsUtil.getContent(company.getCompanyId(), PropsKeys.ADMIN_EMAIL_USER_ADDED_SUBJECT);
2String adminEmailUserAddedBody = PrefsPropsUtil.getContent(company.getCompanyId(), PropsKeys.ADMIN_EMAIL_USER_ADDED_BODY);
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