Hi Eylum,
I do not currently have any translations for the plugin, however it is possibly to support the WordPress community and add translations yourself at this page: https://translate.projectdmc.org/projects/wp-plugins/fast-etsy-listings/ Once added, these would be automatically downloaded to your WordPress site as part of the standard WP plugin repository system.
The plugin does share much code with it’s sibling plugin Fast eBay Listings, which has been translated to UK English and German, so I can certainly investigate how much can be re-used to translate Fast Etsy Listings into German.
What language(s) were you interested in seeing the plugin translated to?
I’m glad you like the plugin nonetheless, if you feel like adding your feedback as a review on here that would be greatly appreciated.
Arthur.