hi @cliff welcome to the Builder forum!
There definitely is a solution we can find for your particular needs. First and foremost, I recommend you check out our docs on localization using customized targeting attributes
You would be able to associate the appropriate data to content within a page, section or symbol and then localize it based on visiting user attributes. If Smartling has an API to access your data as a JSON, it should be fairly straightforward to connect into Builder, and you should be good to go. If not, there may be other options to import your data into Builder or one of our many content partners to access directly on your page.
There is a lot of info here, but the short answer is yes! You probably have a few options to achieve your desired outcome. Take a look, let us know if you have any other specific questions, we would be happy to help!