The app further allows for downloading language packs so you can get translations when offline, and it offers a very impressive overall level of both speech recognition and translation accuracy. (techradar.com)
We fixed an issue for Insiders where the localized files and registry keys associated with any additional language packs on the system would not be installed after enabling. (blogs.windows.com)
If you have additional language packs installed on your machine, it's recommended that you hold off on checking for updates. (neowin.net)