Install this BIGGY on your iPhone 
and then Add to Home Screen
—to change the interface, help content, and proofing tools to Turkish Microsoft Learn Key Features Full Localization
If you need to deploy (e.g., Turkish + German + English), install all VL language packs first, then use Group Policy or a login script to set the default per user: Microsoft Office 2016 VL Turkish Language Pack ...
The Turkish pack includes:
A 64-bit Office install a 64-bit language pack. A 32-bit Office install requires a 32-bit pack. —to change the interface, help content, and proofing
msiexec /i "tr-tr\proofing_tr_tr.msi" /quiet /norestart msiexec /i "tr-tr\interface_tr_tr.msi" /quiet /norestart —to change the interface
After installation, the language pack is installed but not set as default.