How do I import a localization spreadsheet?

I’ve just figured out how to translate all of my localization spreadsheet, what do I save it as (file type) to import it back to Roblox?

That would be .csv files. You can import CSVs into LocalizationTable objects in Roblox like so (right click for context menu):
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I recommend reviewing the articles on localization on the wiki, since they answer a lot of questions like this one.

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