Hi,
Thank you for noticing, there is indeed an issue with the string translations there, they are not properly registered. To resolve this, a file has to be replaced with the corrected version. Please follow this guide:
1. Make sure to have a full site backup just in case
2. Open up the wp-content/plugins/ajax-search-pro/includes/views/asp.shortcode.php file on your server via FTP
3. Replace it’s contents with this
4. Save and refresh the plugin pages
Now, on the WPML string translation pages you should be able to see the missing keywords under “Keyword suggestion” strings.