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This thread is resolved. Here is a description of the problem and solution.
Problem: What is the easiest way to add another MailChimp feed for each language version?
Solution: You need to add in each language version the correct subscription list ID/shortcode.
If the form is attached to a widget, you can also create a separate widget for each language.
Relevant Documentation: https://wpml.org/documentation/getting-started-guide/translating-widgets/