Parse given translate-values

This enable to separate scope data from translation data without
using the controller as this is a view-related task.

Now if we have this in our controller :
``` javascript
$scope.user = {
   names: {
      nickName: 'Octotek',
      name: 'Aestek'
   }
};
```

We can have this in our view:
``` html
<div translate="say-hello" translate-values="{name: user.names.nickName}"></div>
```