$ sudo apt-get update
$ sudo apt-get install firefox-locale-hsb 

firefox-locale-hsb is installed in your system.

Make ensure the firefox-locale-hsb package were installed using the commands given below,

$ sudo dpkg-query -l | grep firefox-locale-hsb *

You will get with firefox-locale-hsb package name, version, architecture and description in a table

firefox-locale-hsb package basic information: