Warning: file_get_contents(/plugin.js): failed to open stream after update to 8.1.2 with new installation method

After update to 8.1.2 with the new installation method I get following error and my ckeditor rendering crashes:

Warning: file_get_contents(/plugin.js): failed to open stream: No such file or directory in _locale_parse_js_file() (line 1133 of core/modules/locale/locale.module).

_locale_parse_js_file('/plugin.js') (Line: 545)
locale_js_translate(Array) (Line: 305)
Drupal\ckeditor\Plugin\Editor\CKEditor->getJSSettings(Object) (Line: 220)
Drupal\ckeditor\Plugin\Editor\CKEditor->settingsForm(Array, Object, Object) (Line: 64)
Drupal\editor\Plugin\EditorBase->buildConfigurationForm(Array, Object) (Line: 176)
editor_form_filter_format_form_alter(Array, Object, 'filter_format_edit_form') (Line: 539)
Drupal\Core\Extension\ModuleHandler->alter('form', Array, Object, 'filter_format_edit_form') (Line: 835)
Drupal\Core\Form\FormBuilder->prepareForm('filter_format_edit_form', Array, Object) (Line: 277)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 93)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 582)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 151)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 693)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)