WordPress error: Plugin isn’t localization-ready

Hey there 👋 
This is a very useful plugin, please allow localization-ready 😬 
I have an error when i’m trying to translate it with Poedit…

WordPress error: The “Also In This Series” plugin isn’t localization-ready.
Name: 'Also In This Series'
Analyzing WP directory /also-in-this-series
not theme - lacks style.css
in /also-in-this-series/plugin.php: header "Plugin Name" = "Also In This Series"
/also-in-this-series/plugin.php is the main plugin file
no load_plugin_textdomain call and lacking metadata
some work is probably required to make the PHP code localization-ready
see https://developer.ww.wp.xz.cn/plugins/internationalization/how-to-internationalize-your-plugin/

Warm regards,
Ludovic