How can the service hub’s knowledge base be set up in multiple languages?
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Excellent suggestions. You may wish to add them to a new or existing thread in HubSpot Ideas.
You’ll typically get much more traction from the HubSpot Community AND the Ideas Forum is where HubSpot Product Teams monitor suggestions for popularity -- i.e., VOTES! 
Hope that helps.
Please include @MFrankJohnson in your message if you’d like me to reply.
Looks like this is now in beta!