Hi there,
New language files are added when WordPress itself is installed in a particular language, or by way of plugins like Loco Translate, for instance. Once present, language files will update whether or not they are in use.
If you’re not using the language, you could remove the language via a language plugin, or delete the language’s .po and .mo files. The files could be located inside the plugin directory, in the /wp-content/language/ directory or a custom directory.
The link below explains how to translate WooCommerce, and will give you further context for how it works:
https://docs.woocommerce.com/document/woocommerce-localization/
It’s been a while since we heard from you, so I’m marking this thread resolved. Hopefully, you’ve been able to resolve this, but if you haven’t, please open up a new topic and we’ll be happy to help out.