Convert Output Event to private BS and readonly Observable

src/app/app.component.html

...als/language-selector/language-selector.presentational.ts

...ract-main-toolbar/abstract-main-toolbar.presentational.ts

...-toolbar-desktop/main-toolbar-desktop.presentational.html

...in-toolbar-mobile/main-toolbar-mobile.presentational.html

src/app/core/utils/observable.util.ts

...nents/containers/deposit-file/deposit-file.container.html

...als/deposit-file-tree/deposit-file-tree.presentational.ts

...deposit-file-upload/deposit-file-upload.presentational.ts

...nts/routables/deposit-create/deposit-create.routable.html

...ponents/routables/deposit-edit/deposit-edit.routable.html

...omponents/routables/home-search/home-search.routable.html

...utables/orgunit-create/orgunit-create.presentational.html

...s/routables/orgunit-edit/orgunit-edit.presentational.html

...ared-abstract-form/shared-abstract-form.presentational.ts

...als/shared-breadcrumb/shared-breadcrumb.presentational.ts

...s/shared-data-table/shared-data-table.presentational.html

...als/shared-data-table/shared-data-table.presentational.ts

...onals/shared-paginator/shared-paginator.presentational.ts

...shared-search-scope/shared-search-scope.presentational.ts