Merge pull request 'features/OZG-2160' (#32) from features/OZG-2160 into master

...rc/components/attachment/attachment-list.e2e.component.ts

...e2e/src/components/attachment/attachment.e2e.component.ts

...mponents/postfach/postfach-mail-formular.e2e.component.ts

...2e/src/components/postfach/postfach-mail.e2e.component.ts

...pps/goofy-e2e/src/components/ui/snackbar.e2e.component.ts

...ient/apps/goofy-e2e/src/fixtures/upload-me.withContent4MB

...ration/main-tests/postfach-mail/postfach-mail.e2e-spec.ts

...-client/apps/goofy-e2e/src/model/vorgang-attached-item.ts

goofy-client/apps/goofy-e2e/src/support/data.util.ts

...lib/snackbar/snackbar-error/snackbar-error.component.html

...c/lib/snackbar/snackbar-info/snackbar-info.component.html

...ib/snackbar/snackbar-info/snackbar-info.component.spec.ts

...editor/file-upload-editor/file-upload-editor.component.ts