Add translate for "Not editable" node 
Add translate for "Not editable" node 

Hello,
There is a message for the not editable node, this one is not translatable. So I modified the line 216 to translate this.
Regards,
tackerm/SonataDoctrinePhpcrAdminBundle,tackerm/SonataDoctrinePhpcrAdminBundle,tackerm/SonataDoctrinePhpcrAdminBundle,sonata-project/SonataDoctrinePhpcrAdminBundle,sonata-project/SonataDoctrinePhpcrAdminBundle,sonata-project/SonataDoctrinePhpcrAdminBundle,tackerm/SonataDoctrinePhpcrAdminBundle