This thread is resolved. Here is a description of the problem and solution.
Problem: I have a problem translating the title of an image in the WP Residence theme. There are a title and a subtitle at the top of the page, over the image, and I can't translate them.
Solution: You need to edit the original page, look for the page_header_title_over_image and page_header_subtitle_over_image custom fields and set them to translate. Just hit the Apply button, save again the page (even if you made no changes to it), and update the translation. This time, you should see the two new elements available for translation.
Relevant Documentation: https://wpml.org/documentation/getting-started-guide/translating-custom-fields/
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