This thread is resolved. Here is a description of the problem and solution.
Problem: How to translate the7 retina logo? or how to change the7 retina logo in second language?
Solution: Make sure you copy the “wpml-config.xml” from the parent theme to your child theme, make sure it is up-to-dated. After that make sure you follow this https://wpml.org/documentation/getting-started-guide/translating-theme-options/ make sure this value is “header-logo_hd” translatable.
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