Hello,
If you want to create the multilanguage site you need to use an additional plugin https://colorlib.com/wp/wordpress-multilingual-plugins/ https://xstore.helpscoutdocs.com/article/31-translation-with-wpml
Then you can edit the header and edit widget areas you want to show there.
Loco Translate plugin can be used to translate the site into 1 language, there is no language Switch option – https://xstore.helpscoutdocs.com/article/30-base-theme-translation
Regards