Once you confirm you have Office 2016 32-bit, you must source the correct language pack. Microsoft no longer hosts most Office 2016 language packs on their public download center for consumer downloads due to product lifecycle policies (Office 2016 mainstream support ended in 2020). However, they are still available via:

Working in your native language isn't just about comfort—it’s about speed and accuracy. If you are a 32-bit Office 2016 user, adding the Arabic Language Accessory Pack transforms your workspace with full right-to-left (RTL) support, localized menus, and precise proofing tools. ⚡ Quick Fix: Set Arabic as Your Primary Language

You can find the necessary files on the Microsoft Support Page for Language Accessory Packs.