You can uninstall or removes an installed gosa-help-de package itself from Ubuntu 16.04 LTS (Xenial Xerus) through the terminal,
$ sudo apt-get remove gosa-help-de
If you would like to remove gosa-help-de and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove gosa-help-de
If you use with purge options to gosa-help-de package all the configuration and dependent packages will be removed.
$ sudo apt-get purge gosa-help-de
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove gosa-help-de
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