To uninstall language-pack-bs just follow these instructions.
sudo apt-get remove language-pack-bs
This will remove just the language-pack-bs package itself.
sudo apt-get remove --auto-remove language-pack-bs
This will remove the language-pack-bs package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for language-pack-bs then this will work.
sudo apt-get purge language-pack-bs
Or similarly, like this language-pack-bs
sudo apt-get purge --auto-remove language-pack-bs
|Maintainer||Language pack maintainers <email@example.com>|
|Description||translation updates for language Bosnian|