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This thread is resolved. Here is a description of the problem and solution.
Problem: The secondary language URL for the images is incorrect.
Solution: The client reported that he had changed the URL for the images and so the problem was happening.
According to him, the problem was solved using the UPLOADS constant inside the wp-config.php file.
You can see more details at the link below.
Relevant Documentation: https://codex.wordpress.org/Editing_wp-config.php#Moving_uploads_folder