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There is no APCu plugin in that sense. Detection is handled by core.apcu.php.
I suspect there's a problem with the language file. I've put all the necessary files into a compressed archive. Please replace the existing files with the ones from the archive. You may also need to set the file and directory permissions (Admin Area -> Maintain -> Restore authorizations for productive operation).

Hi, I transferred your files and now APCU is working on www.guerrenelmondo.it (as you see in the first picture).

If you have the same files for my english website (www.warsintherold.com) you can see in the second picture attached, could you send me. I appreciate, it has the same problem of guerrenelmondo.it

I've only added the English language file.