[BUGFIX] Fix backend module

Classes/Controller/BackendController.php

Classes/Service/BackendService.php

Classes/ViewHelpers/Backend/ControlViewHelper.php

Resources/Private/Backend/Layouts/Default.html

Resources/Private/Backend/Partials/Error.html

Resources/Private/Layouts/Backend.html

Resources/Private/Partials/Backend/ButtonBar.html

Resources/Private/Partials/Backend/CreateJob.html

Resources/Private/Partials/Backend/Filter.html

Resources/Private/Partials/Backend/Pagination.html

Resources/Private/Partials/Backend/SelectRoot.html

Resources/Private/Templates/Backend/Index.html