I just published my first application on Google Play and I accidentally chose the wrong language as default language for my application. I set \"German\", though my app is actua
Go to Google Play Console > Store presence > Store listing.
Click Manage translations button, then Add your own translation text and select English (United States) - EN-US from the list.
Once you have two different languages set for your app, click again on Manage translations and choose Select default language, going for the right one this time.
If you want to remove the previous language, select Manage translations and then Remove translations.