Translations were missing from FS-UAE Launcher on Windows and Linux, so I've posted new versions on
https://fs-uae.net/download with translations included
Also, due to changes in SDL2, some controllers (Xbox controllers at least) have new GUIDs and the bundled configurations no longer match. So you need to remap your controller in Launcher settings if you cannot utilize all buttons anymore. I'll see if I can get new and updated controller configs included in an update!