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The typical way to translate a WordPress theme requires that you use .PO and .MO files in the /languages directory of the theme.
Full path to the languages folder is /wp-content/themes/listingpro/languages
However, if you make any edits to a parent theme, including adding translation files to the theme, your edits will be overwritten (and completely lost) once the theme is updated.
Instead, it is best to upload your translation files directly to your child theme /languages folder.
For step by step instructions check How to move translation to Child Theme?