If you upgraded to Android 13 and are disappointed that only a couple of apps appear in the new per-app language settings, you can forcefully make every app appear in the list with a simple ADB shell command.

The ADB shell command is:

adb shell settings put global settings_app_locale_opt_in_enabled false

Here's a before and after of the list.

I mentioned this flag in my Android 13 deep dive and explained how the feature works in general, if you're curious to learn more.

(Note that just because an app can appear on this list doesn't mean its support for a particular language will be good. Many apps use machine translation for some languages, mainly due to a lack of knowledge of the language or a lack of resources to commit to translating. Android 13 lets apps opt in to this system so developers can present the languages they know their app supports well.)