You can now change language for Regency Solitaire II on Steam via the options screen.
Supported languages are: English, German, French, Spanish, Italian, Dutch, and Brazilian Portuguese.
Note: at present we have no plans to officially support more languages because we are an indie microstudio. But we welcome fan translations.
Enjoy playing Regency Solitaire II in your chosen language!
https://store.steampowered.com/app/2137470/Regency_Solitaire_II/