replace specific Locale characters by English in images names

When i execute
```
php app/console doctrine:fixtures:load
```

I have got 
  [RuntimeException]
  The file does not exist : D:\02_Development\_git-hub\sonata-admin-sandbox\src\Sonata\Bundle\DemoBundle\DataFixtures\ORM/../data/files/hugo-canada\2010-06-24 a? 13-40-07.jpg