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This thread is resolved. Here is a description of the problem and solution.
Problem: How to translate custom strings
Solution: If you follow the procedure to make the strings translatable, then you should be able to translate it in WPML > String Translation. If not, that means you are making some mistakes in the 'gettext' format: 1. https://wpml.org/faq/getting-string-translation-to-work/ 2. https://codex.wordpress.org/I18n_for_WordPress_Developers#Introduction_to_Gettext
After you follow the format, do not forget to this: https://wpml.org/documentation/getting-started-guide/theme-localization/#scanning-themes-for-texts
Then go to WPML > String Translation search the text you will be able to find it.