It can be done though. In WPML it is even THE way to make admin settings multilingual. All you need to do is to create a language configuration file. When themes and plugins use get_option, they read values from the wp_options table. WPML can filter these calls and provide translation to the values of these options. For more details, see Admin texts / wp_options https://wpml.org/documentation/support/language-configuration-files/#admin-texts
It can be done though. In WPML it is even THE way to make admin settings multilingual. All you need to do is to create a language configuration file. When themes and plugins use get_option, they read values from the wp_options table. WPML can filter these calls and provide translation to the values of these options. For more details, see Admin texts / wp_options https://wpml.org/documentation/support/language-configuration-files/#admin-texts