You are editing the filed not the content type
1st Internationalization | Strapi Documentation
you need to add the i18n languages you want if this option is not avalible and you are a super-admin that means that the I18n plugin is not installed or you did not rebuild the admin
then in the content-type builder you can press edit next to the collection name to change it (if you can’t see it it means you don’t have the right permisisons