You can uninstall or removes an installed hunspell-dictionary-be package itself from Debian 8 (Jessie) through the terminal,
$ sudo apt-get remove hunspell-dictionary-be
If you would like to remove hunspell-dictionary-be and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove hunspell-dictionary-be
If you use with purge options to hunspell-dictionary-be package all the configuration and dependent packages will be removed.
$ sudo apt-get purge hunspell-dictionary-be
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 hunspell-dictionary-be