message: Use expected spelling of preferred language key
  (will take effect once is merged)
diff: @@ -190,7 +190,7 @@ app.use(['/.well-known/security.txt', '/security.txt'], securityTxt({
  contact: config.get('application.securityTxt.contact'),
  encryption: config.get('application.securityTxt.encryption'),
  acknowledgements: config.get('application.securityTxt.acknowledgements'),
  - preferredLanguages: [...new Set(locales.map(locale => locale.key.substr(0, 2)))].join(', '),
  + 'Preferred-Languages': [...new Set(locales.map(locale => locale.key.substr(0, 2)))].join(', '),
  expires: securityTxtExpiration.toUTCString()
  }))
  