FEAT #13983 TIME 8:50 fix collabora online problems + refactor

...ntentManagement/controllers/CollaboraOnlineController.php

src/frontend/app/signature-book.component.html

src/frontend/app/viewer/document-viewer.component.html

src/frontend/app/viewer/document-viewer.component.ts

...s/collabora-online/collabora-online-viewer.component.html

...s/collabora-online/collabora-online-viewer.component.scss

...ins/collabora-online/collabora-online-viewer.component.ts

...lugins/onlyoffice-api-js/onlyoffice-viewer.component.html

...lugins/onlyoffice-api-js/onlyoffice-viewer.component.scss

.../plugins/onlyoffice-api-js/onlyoffice-viewer.component.ts