This thread is resolved. Here is a description of the problem and solution.
Problem:
The client wants to translate the "I would like to receive exclusive emails with discounts and product information" string that is coming from Mailpoet plugin
Solution:
I’m able to translate that string by following the steps from this thread:
https://wpml.org/forums/topic/translate-mailpoet-to-enable-customers-sentence/#post-7448773
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