If a plugin has a string which is…

If a pluginPlugin A plugin is a piece of software containing a group of functions that can be added to a WordPress website. They can extend functionality or add new features to your WordPress websites. WordPress plugins are written in the PHP programming language and integrate seamlessly with WordPress. These can be free in the WordPress.org Plugin Directory https://wordpress.org/plugins/ or can be cost-based plugin from a third-party has a stringString A string is a translatable part of the software. A translation consists of a multitude of localized strings. which is also in the WP coreCore Core is the set of software required to run WordPress. The Core Development Team builds WordPress., should it add a text domain or not?

For example, Yoast SEO adds it: __( ‘Settings’, ‘wordpress-seo’ )