Steps to Reproduce

• Click on the “Languages” tab, and then on “Create a new language”. Use the following values:
  Name: “French Test”
  Language code: fre-FR
• Edit the “app/config/ezplatform.yml” file and add the fre-FR language as showed below:
  ezpublish:\system:\site_group:\languages: [eng-GB, fre-FR]
• Create one content type with a media/image/files attribute, setting the attribute as "not translatable"
• Create one English object of the previous content type (set an image/media/file at will)
• Publish
• Create a French translation
• Here we can see that the image/media/file field is grey and can't be accessible
• Now drag&drop an image/media/file into it

We can see that the file is uploaded and the French translation for the field is set when it shouldn't, since the field i snot translatable