The reason why we don't use po/mo for translation is we'd like to change the display language by the language setting of the browser of visitors.
If we use po/mo for translation, this plugin will be displayed in the language you determined at the WordPress Admin Panel.
We don't use the po/mo system in our plugin in order to automatically display the most optimal one by the language setting of the browser of visitors.
So, you have to edit a conf file of this plugin in order to translate this plugin. We are sorry for the inconvenience.