I use String Catalog to localize my app (built in English) to Japanese.
The app works fine and supports both languages. I have tested on TestFlight, and the live version download from App Store also supports 2 languages.
But the display on App Store only indicates Japanese.
I have no idea why the number for localized files show 0 for both English and Japanese. The Localization of Japanese works fine.
How to fix this?
Fixed!
I don't know which one of this is the one that fixes this issue. I didn't try it separately, just did both the same time.
In String Catalog, I marked all English locale to be "Reviewed". Doing this will turn the existing grey texts into black
App Store Connect warned me that I didn't have a localization for custom intent (for widgets). In Xcode, in the intent file, I click Localize in the Inspectors. Doing this will increase the number of File Localized to 1 for each locale.
Note: I just realized that in App Store Connect, when you will your app in TestFlight tab. There is a Build Metadata, and if you scroll down you will see Store Information section. This will list all supported languages. You can check this before actually publish your app.