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Solution:
Delete the WPML plugins through FTP, and install them back (through FTP too). The issues is that some files were missing but everything went back to normal once installing the plugins though FTP.
Problem:
I am trying to translate Strings in the Woocommerce Pre-Orders plugin (Available: and charged upfront). Solution:
Adding this XML to WPML → Settings → Custom XML Configuration made the fields appear in String translation:
