[This post contains formatting and embedded images that don't appear in email. View the post in your Web browser.]
Unfortunately, there is no way to batch-edit keywords -- it's been requested many times in the past.
"I have used the plugin Find and replace to add some IPTC data to my keywords. I don't know why but when i exported them I say that this keywords did not appear on the exported files."
You can enable the Include On Export attribute for keywords created by the Search Replace Transfer
...