Internationalization is the process of developing a plugin, so it can easily be translated into other languages. Internationalization is often abbreviated as i18n. This plugin is not made ready to be translated. This feature needs to be implemented, so others are able to translate this plugin.

See link for more info: https://developer.wordpress.org/plugins/internationalization/