Using Office Deployment Tool to install Office 365/2016/2013 (Multilanguage) - MS Guides
Set Proofing and Display Language in Microsoft Office 365 Applications | Smart Office
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Deploying Office 2016 and Office Proofing Tools Kit 2016 / Office 2016 language packs with SCCM 2012 R2 – A random blog from a sysadmin