How can I get the render language for a views in views field plugin

Question

I need to write a views field plugin, where I need to display a message depending on if the render language exists for an entity. (i.e. entity languages: en, hu, fr display language: de -> message needs to show up, i.e. entity language: en, hu, fr display language: en -> no message) But for this, I can't get the language from the views. I can get the settings with $this->view->display_handler->getOption('rendering_language') but this can contain also dynamic values like ***LANGUAGE_entity_translation*** or ***LANGUAGE_entity_default***. I looking for a solution that can give me a specific language code that was made by the rendering language setting.