https://wpml.org/errata/translation-second-language-loaded-mo-files-used/
Translation from second language are loaded when MO files are used - WPML
Sep 21, 2016 - The problem manifest itself when: Using WordPress 4.6.0 and higher. There is more than one language defined Option Don't use String Translation to
second languagemo filesloaded
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https://wpml.org/faq/cannot-write-mo-files/
Why can’t WPML write MO files for String Translation? - WPML
mo filesstring translation