Links labels to previous and next chapters are double escaped

In the Propel chapter of the book, the links labels at the bottom of the chapter that point to the previous and next chapters are double espaced. We have this output:

```
« Databases and Doctrine (&quot;The Model&quot;) | Testing » 
```

Instead of this:

```
« Databases and Doctrine (« The Model ») | Testing » 
```
