This thread is resolved. Here is a description of the problem and solution.
Problem:
You can't translate a string from the Advanced Icon Box element from the Element Pack Pro add-on
Solution:
Element Pack Pro is not compatible with WPML. We recommend replacing the Advanced Icon Box element with a standard Elementor widget that is compatible with WPML. You can find more information about the Icon Box Widget from Elementor here: https://elementor.com/help/icon-box-widget/
Please note that this solution might be irrelevant if it's outdated or not applicable to your case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue persists, please open a new support ticket with us.
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This topic is split from https://wpml.org/forums/topic/i-could-not-find-where-to-translate-the-string-meer-weten/