kdeplasma-addons-data software package provides locale files for kdeplasma-addons, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install kdeplasma-addons-data
kdeplasma-addons-data is installed in your system.
Make ensure the kdeplasma-addons-data package were installed using the commands given below,
$ sudo dpkg-query -l | grep kdeplasma-addons-data *
You will get with kdeplasma-addons-data package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | KDE |
| Package | kdeplasma-addons-data |
| Version | 4:5.5.5-0ubuntu1 |
| Description | locale files for kdeplasma-addons |
| Sub Section | KDE |