title: CakePHP Localization issue
body: <p>I follow the cakePHP book to config the i18n and l10n of my site. Suppose I have English, Spanish, German.</p>
  
  <p>Browsers usually have a list of languages ordered by priority. If at the first position of the list appears a language that is configured on my site all works fine. But if, for example, the list is this: French, German, Spanish, English; localization fails and shows the i18n identifiers that I used in my code.</p>
  
  <p>I would like that in this case the page appears translated in German, because in the list is the first language that my site can provide. This would be the perfect solution but at least I would like that I can configure a default language (for example, English) if the first language of the browser list is unknown by my page.</p>
  
  <p>What I can do to achieve this and where should put the code?</p>
  
  <p>Thank you in advance.</p>