The Terra widget currently supports the following languages:

• English (en)
• Spanish (es)
• Arabic (ar)
• Finish (fi)
• Portuguese (pt)
• Swedish (sv)
• Dutch (nl)
• German (de)
• French (fe)
• Japanese (ja)
• Turkish (tr)
• Vietnamese (vi)
• Chinese - Traditional (zh)
• Chinese - Simplified (zh_CN)
• Chinese - Hong Kong (zh_HK)

You can select these by passing in a lang: [language_code] in the request body when generating the widget.