The translation of the Magento 2 category page doesn't require the creation of the new one.
Following steps to translate Magento 2 category:
1. Navigate to Catalog > Categories and change the store view to the one you want to translate the category to.
2. Choose the category you want to translate.
Every attribute of the category in different store view is set by default. Remove the checkmark and set your own value of this or that attribute.
3. Set the URL Key in order to help Google direct customers to the corresponding Magento category page.
Sometimes, users are directed to the 404 page while switching the storefront. That usually happens because of the absence of the alternate hreflang tags on each of those pages to direct readers to the other. In case you want two or more Magento 2 categories pages in different languages to be interconnected you can install the Magento 2 Alternate Hreflang extension.
Category Translation is just one of the series of articles about How to Configure Multi-Language Magento Website? which include information about the creation of a new store view, language packs installation, useful multi-language store extensions, CMS pages&blocks, email templates, and other translations in Magento 2 website. You should definitely get acquainted with them in order to know how to manage a multi-language store.