Questions about Microsoft Office Home & Student 2021

Can this Office be switched to German? It should actually work after German has been downloaded from https://support.microsoft.com/de-de/office/language-accessory-pack-f%C3%BCr-office-82ee1236-0f9a-45ee-9c72-05b026ee809f. Because this product is 20.- cheaper than https://www.digitec.ch/de/s1/product/microsoft-office-home-student-2021-unbegrenzt-1-x-windows-mac-os-deutsch-office-software-16447465.

112.- Microsoft Office Home & Student 2021 Unlimited, 1 x, Windows, English (Item 16756794) Which MS Office products (Excel, Word, etc..) does this licence include?

Hi, I'm looking for an one-time purchase Office for Mac in English. This one here is only for Windows right?

Which Office programmes does this product contain