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This thread is resolved. Here is a description of the problem and solution.
Problem: Some of my strings cannot be translated. I registered them using the language configuration file but it didn't help.
Solution: When you register your strings using the language configuration file, please double check if you use the correct option names or if you didn't do any typos. Also, check if the file is uploaded in the correct place. If you use a child theme, wpml-config.xml file should be added to the child theme's root folder.
Relevant Documentation: https://wpml.org/documentation/support/language-configuration-files/