This is great news and a really important plugin that should finally be merged into core! But I would phrase it as "it has ONLY 2000 installs". Every website using a language variant like "German (formal)" one of the many variants of Spanish for example will need this in core. When those variants were introduced, I wrote a plugin for this purpose as well, but the "Preferred Languages" plugin is more feature rich and the one we need in core. I'll gladly remove my plugin then and be happy people would no longer need it. Even with the 7000 installs of my plugin, we are not even close to the number of WordPress sites this would benefit. So please folks: do test the plugin and give feedback, so we can finally get it merged! 🙏