$ sudo apt-get update
$ sudo apt-get install libvaladoc-data 

libvaladoc-data is installed in your system.

Make ensure the libvaladoc-data package were installed using the commands given below,

$ sudo dpkg-query -l | grep libvaladoc-data *

You will get with libvaladoc-data package name, version, architecture and description in a table

libvaladoc-data package basic information: