Hello,
Thank you for reaching out to Constant Contact API Developer Support.
Most of the Latin-based languages use the standard 8-bit Character Encoding that Constant Contact and virtually all email clients support. Text written in these languages can be used without any hassle or compatibility issues. Examples of 8-bit languages include English, Danish, Dutch, French, German, Italian, Norwegian, Portuguese, Spanish, and Swedish. These are also the languages that Constant Contact supports for the Email Footer/Privacy Policy.
Other languages, such as Japanese, Mandarin, Chinese, Korean, and Vietnamese use a 16-bit Character Encoding (sometimes referred to as "Double-Byte" or "Unicode" characters). Constant Contact does not officially support these languages. At this time there are no plans to change the way our API currently interacts with them in this way.
I have passed your feedback on to our product team for consideration. Please let me know if you have any other questions!
Regards,
David B. Tier II API Support Engineer
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