Rename Taxonomies by WebMan

Navigate to Tools → Rename Taxonomies in your WordPress dashboard. Then click the taxonomy you want to rename and fill the form fields displayed. That’s it.

(Note that you might need to refresh the WordPress dashboard once the form is saved to preview the changes.)

Well, this is most likely caused by your theme (or a plugin) hard-coding the taxonomy name. Please contact your theme (or a plugin) developer to update their code and use WordPress taxonomy labels instead of hard-coding them.

Yes, the interface of the plugin is translation ready and you are perfectly fine to use it on single-language website.

For multilingual website please read below.

You can translate the plugin directly in WordPress repository. Thank you!

If you are building a multilingual website and want to translate the customized taxonomy labels, this is possible using WPML or Polylang multilingual plugins.

Please note that if you have already customized your taxonomy labels, you need to re-save your customizations to register them for translation with the multilingual plugins.

Other solution would be to use WordPress multisite approach to build a multilingual website.

The plugin disables customization for certain WordPress native taxonomies. The list consists of link_category, nav_menu and post_format.

In case you want to edit this list, use a rename_taxonomies_skipped_keys filter hook via your theme or plugin code:

function my_prefix_rename_taxonomies_skipped_keys( $taxonomy_keys ) {
    return array(
        'link_category',
        'nav_menu',
        'post_format',
    );
}
add_filter( 'rename_taxonomies_skipped_keys', 'my_prefix_rename_taxonomies_skipped_keys' );

The custom taxonomies that have no edit UI will be skipped too.