Merge branch 'master' of git.ozg-sh.de:mgm/goofy

# Conflicts:
#	goofy-client/libs/postfach-shared/src/lib/postfach.util.spec.ts
#	goofy-client/libs/postfach-shared/src/lib/postfach.util.ts
#	goofy-client/libs/postfach/src/lib/postfach-mail-list-container/postfach-mail-list/postfach-mail-list.component.html
#	goofy-client/libs/postfach/src/lib/postfach-mail-pdf-button-container/postfach-mail-pdf-button-container.component.html
#	goofy-client/libs/postfach/src/lib/postfach-mail-pdf-button-container/postfach-mail-pdf-button-container.component.ts
#	goofy-client/libs/ui/src/lib/ui/button-with-spinner/button-with-spinner.component.html