Hi!
There are many ways of localizing content, regardless of where you plan to present it. I would start by reading up on the documentation to figure out what type of localization of the content model suits your use case best: https://www.sanity.io/docs/localization
You can also check out this tutorial for Gatsby and Sanity specifically. https://www.gatsbyjs.com/blog/2019-03-01-localization-with-gatsby-and-sanity/ But it pretty much boils down to that you get content on localized fields in Gatsby's GraphQL API. Best of luck!
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