This thread is resolved. Here is a description of the problem and solution.
Problem: I can not find the correct place to translate the post type name. I'm using the plugin CPT UI - https://wordpress.org/plugins/custom-post-type-ui/
Solution: If you create the post types in CPT UI, you need to translate its strings related to CPT UI.
So far, to translate these strings, please follow our guide https://wpml.org/documentation/getting-started-guide/string-translation/ , section “Translating strings in the wp_options table”.
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