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This thread is resolved. Here is a description of the problem and solution.
Problem: Is it possible to translate the MailChimp HTML5 validation messages? eg: please match the format request : https://cdn.wpml.org/wp-content/uploads/2019/05/3920803-form_validation_translation.png
Solution: The error messages from Mailchimp are based on the browser language and appear in different design depending on the browser you are using.
Chrome with German: https://cdn.wpml.org/wp-content/uploads/2019/03/3357151-Chrome_Deutsch.png
Firefox with Englih : https://cdn.wpml.org/wp-content/uploads/2019/03/3357151-Firefox_English.png
WPML can translate strings from themes and plugin but not from the browsers.