change SiteName (multilanguage)

What plugin are you using to facilitate multilingual functionality on your site? There are extension plugins available that add support for Polylang and WPML in Breadcrumb NavXT, which one to use depends on if you are using Polylang or WPML.

I am using WPML.

For WPML, you may find this article helpful: https://mtekk.us/archives/wordpress/plugins-wordpress/breadcrumb-navxt-and-wpml-compatibility/