revert ts message to html message; date-with-time-pipe -> nil safe

...s/tech-shared/src/lib/pipes/format-date-with-time.spec.ts

...t/libs/tech-shared/src/lib/pipes/format-date-with-time.ts

...organg-redirect-info/vorgang-redirect-info.component.html

...ang-redirect-info/vorgang-redirect-info.component.spec.ts

.../vorgang-redirect-info/vorgang-redirect-info.component.ts

goofy-client/libs/vorgang-shared/src/lib/vorgang.messages.ts