Microsoft has documented this on this DOCS page:

When building your WVD image for W10 Multisession you need to add the language pack to the image. My native language is Dutch, and I work for a lot of Dutch clients who want their WVD also in Dutch.Īdding a different language manually on a Windows 10 laptop is not so hard, just go to the settings, language add the language … well you know the drill. Windows Virtual Desktop – Windows 10 Multisession – comes only in one language, that is English.