In case you are wondering where are the Office 2016 Proofing tools, then I can tell you that they are included in Language Accessory Pack https://support.office.com/en-us/article/Language-Accessory-Pack-for-Office-2016-82ee1236-0f9a-45ee-9c72-05b026ee809f
At this point there is no separate package for Office 2016 Proofing Tools. A while ago there was an "Office 2016 Proofing Tools - Beta" download available, but now this link doesn't work either.
So if you install Language Accessory Pack, then you could also get some text localized in Office programs. For example Skype for Business and Visio headers will show localized names.