$ sudo apt-get update
$ sudo apt-get install libjs-i18next 

libjs-i18next is installed in your system.

Make ensure the libjs-i18next package were installed using the commands given below,

$ sudo dpkg-query -l | grep libjs-i18next *

You will get with libjs-i18next package name, version, architecture and description in a table

libjs-i18next package basic information: