In the new update 1.14 Ink Calendar will use the language settings you have set in Windows 10. The month names, days of the week, and day abbreviations will all be translated automatically by Windows.
Next up I will be translating the text in the app itself. All the button text will soon be translated with the help of anyone I know who speaks that language! If you’d like to help translate then email firstname.lastname@example.org
As always, thank you for using Ink Calendar