You did login to this account with German language for the first time.
Therefore your personal address book and personal calender (and eventually your collected address book) where initially created with German default names.
There are no automatic translations for these names in SOGo.
You can change them manually to whatever you like.

The name of the global address books (yes there can be multiple of these) are set in sogo.conf by the admin of that SOGo instance for all users of the same domain.
There is no way to set those names in multiple languages.

Because of that, these are no errors.
If you really need automatic translation for those names, you should open two enhancement requests for them.