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Where do I find it? I cannot find it in the language files.

Thank you

This is from the DISQUS application itself.
You need to set up your language on Disqus site and at Disqus content plugin
You should verify the official translation at www.transifex.com/projects/p/disqus/

For the Joomla extension translation you will find it here:
www.transifex.com/projects/p/discuscomments/

How to add transifex pluggin in Joomla