Install the Language Accessory Packs for Office 2016

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Install language accessory packs after installing Microsoft Office, to add additional display, help, or proofing tools.

Install the language accessory pack for your desired language.
Open any Office program, click File > Options > Language.
Under Choose Editing Languages, make sure the language you want to use is added to the list.
Under Choose Display and Help languages, change the default display and help languages for all Office apps.
Restart all Office programs, so your changes can take effect.