This app is really long in the tooth, it could do with an update where everything is displayed using the material native UI. But for now, I have just done a quick update to get it to the Google Play new standard. The app bar was using some old libraries that I had to run a bunch of function override’s to get it to work on the settings screens, and also it has lost the menu icon on the top left. But I don’t think the menu was that useful. You can still side swipe to access it.
I found a bug when you rest to the default language. This has also been fixed