Visible Details-Tab on Shadowarticles

[Quehnie]

Q	A
Bug?	yes
New Feature?	no
SuluArticleBundle Version	2.1.2
Sulu Version	2.2.7

Actual Behavior

If you use the "activate shadowpage" there is no validation if a language is selected.
Also if activated the "Details" - Tab should not be visible anymore.

Expected Behavior

validation of the shadowpage language-selection and a non visible details-tab

Steps to Reproduce

Create an article in language A and create an article in language B which is article B references on article A as a shadowpage.