I've found two ways you can do this. The first is to install the language packs found at Zen Cart's site: Zen Cart Language Packs I'm also including information on language files and how they are implemented in Zen Cart:
Language Files - What are they and how are they used?
Languages from Zen Cart Wiki
The second way you could do this would be to install the Google Translate for Zen-Cart plugin
Hope this information helps!
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