Asset are not creating File objects for files that are not the default locale

[dlitvakb]

Assets are not properly coercing files in all locales to Contentful::File objects, only the default locale.

Example:

> asset.instance_variable_get(:@fields)
=> {"en-US"=>
  {:title=>"EN Title",
   :description=>"EN Description",
   :file=>
    #<Contentful::File:0x007fcc52b49aa8
     @content_type="image/svg+xml",
     @details={"size"=>899},
     @file_name="Flag_of_the_United_States.svg",
     @url=
    "//assets.contentful.com/bht13amj0fva/14bZJKTr6AoaGyeg4kYiWq/13f00bdf75c1320061ce471a3881e831/Flag_of_the_United_States.svg">},
 "es"=>
  {:title=>"ES Title",
   :description=>"ES Description",
   :file=>
    {"url"=>
      "//assets.contentful.com/bht13amj0fva/14bZJKTr6AoaGyeg4kYiWq/5501c98c296af77b9acba1146ea3e211/Flag_of_Spain.svg",
     "details"=>{"size"=>60255},
     "fileName"=>"Flag_of_Spain.svg",
     "contentType"=>"image/svg+xml"}}}