Translation

When I install the plugin, only half of the text is translated into my locale (danish). I would like to contribute, but at https://translate.www.ads-software.com/projects/wp-plugins/pta-volunteer-sign-up-sheets/ i get the message:

“This plugin is not properly prepared for localization (View detailed logs on Slack). If you would like to translate this plugin, please contact the author.”

Is there a way to contribute to the translation of the rest of the items.