What steps should you take to support this in your community?
Your company is using the Napili template and is expanding internationally and now requires your Community to support multiple languages.
A. Enable the Language Picker in the Community Builder. Salesforce will automatically present a list of supported languages B. Enable Community Language Picker in the setup menu and select the supported languages in the Community Builder C. Select the available languages in the Setup Menu and drag the Language Picker onto the Community Template D. Multiple community languages are not supported5. Enable the Language Picker in the Community Builder and select the supported languages in Community Settings
What sounds like the easiest way to enable the language picker to me is to go to the available languages option in the setup menu and drag the language picker onto the template, or answer C.
I should say before we go any further that I do not have experience with SalesForce, but this sounds like the most intuitive way to do it, regardless of the fact that this is what the previous answer states.
Having a language picker on the community template at this point would be very helpful. However, I don’t know if SalesForce supports most common languages that are spoken nowadays or if it supports practically every language out there that is spoken today. It could be either one.