Restrict admin/content view by organic group membership
You can add a module that implements hook_query_alter like:

function gestionsesion_query_alter(QueryAlterableInterface $query) {
global $user;
if (current_path() === 'admin/content'){    
    if ($query-&gt;hasTag('tablesort')) {              
        $query-&gt;condition('n.language', $user-&gt;language );      
    }
    }
}


Here we filter by user language but you could do it by role...