FIX #11691 TIME 1:00 added attachment management privilege

migration/19.12/1912.sql

src/app/attachment/controllers/AttachmentController.php

src/app/attachment/models/AttachmentModelAbstract.php

src/frontend/lang/lang-en.ts

src/frontend/lang/lang-fr.ts

src/frontend/lang/lang-nl.ts

src/frontend/service/privileges.service.ts