If the default siteaccess only has nor-NO as language you can’t edit content classes in the backend.

http://site/ez#/admin/pjax%2Fcontenttype%2Fgroup%2F1

The content types is listed without a name and when I try to edit the folder type I get his error message:

Key "nor-NO" for array with keys "eng-GB" does not exist in EzSystemsRepositoryFormsBundle:ContentType:field_definition_row.html.twig at line 6

Steps to reproduce.

• install ezstudio 16.02 with default configuration
• edit ezplatform.yml and comment all languages from system|site, leaving nor-NO as the only one enabled
• attempt to edit any content type (folder, for instance)
  => Operation will fail with
  Key "nor-NO" for array with keys "eng-GB" does not exist in EzSystemsRepositoryFormsBundle:ContentType:field_definition_row.html.twig at line 6 error