FEAT #13983 TIME 14:00 collabora online template edit/creation + clean code

apps/maarch_entreprise/xml/documentEditorsConfig.xml

rest/index.php

...ntentManagement/controllers/CollaboraOnlineController.php

...inistration/template/template-administration.component.ts

...FileEditorModal/template-file-editor-modal.component.html

...teFileEditorModal/template-file-editor-modal.component.ts

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

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

src/frontend/lang/lang-en.ts

src/frontend/lang/lang-fr.ts

src/frontend/lang/lang-nl.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