title: NSPredicate with a localized value for key
body: <p>I have a core data entity with a property "title", that is a string for a localized table.
  I need to be able to create a predicate and a sort descriptor that will allow me to compare by Localized(title) instead of just title.
  Is it possible?</p>
  
  <hr>
  
  <p>Edit:
  Say i Have an Entity called "<code>Person</code>". This entity has a property "<code>stringForALocalizedTable</code>", so that for one language <code>NSLocalizedString(person.stringForALocalizedTable)</code> will result "Alex", and for another language it will result "Alexander".
  I want to create a predicate like </p>
  
  <pre><code>[NSPredicate predicateWithFormat: @"NSLocalizedString(stringForALocalizedTable) == %@", @"Alex"]
  </code></pre>
  
  <p>I guess it is possible with <code>predicateWithBlock:</code> method, but I cannot use it with core data.</p>