The WooCommerce Product Page Shipping Calculator plugin inherits the shipping calculator which is part of WooCommerce itself. It doesn't add any other text to your website.

If the shipping calculator is not translated automatically using the translations which are built into WooCommerce, then you can follow the instructions for Translating WooCommerce. These will equally apply to the shipping calculator on the product page.

If you want to translate the plugin settings which appear in the WordPress admin, then you can do this using any string translation plugin such as WPML or Loco Translate. You can also use this method to change the word 'Shipping' which appears when you show the shipping calculator within its own tab on the product page.