Make plugin translatable

I want to translate the plugin, but on the translation page it says the following and does not allow to translate it:

This plugin is not properly prepared for localization. If you would like to translate this plugin, please contact the author.

Import results are logged on Slack in the #meta-language-packs channel. Please see the handbook for details about Slack and possible errors.

The page I need help with: [log in to see the link]