How to batch hide extensions using Automator or Finder Service?

Thank you Viking OSX for your answer, however this does not work in my case.. below you can see the action (though in my language) ; as said in I right click a folder and select the quick action, nothing happens; but if I select just files it works...

Dont know what to think... (I though it might be a question of rights on the folder, but in this case I should not be able to rename, or delete the folder, so I don't think its a question of owner rights..)

I don't want change of course the extension of the folder, but of the files inside..

I can't Believe that! It worked!... I only replaced the first occurence of "Folder" with "Cartella" (the second occurence I'm not allowed, I get an error message whereas "" are expected, but even if I put "Cartella" I still get the error) and it worked...!

I'm quite surprised though.. I don't know anything of programming language, however I always noticed that in Terminale for examples any names of folder is always translated by the terminal in English; so that If I drag and drop the folder "Immagini" for examples (the name that appears in the Finder, into the terminal window, it translate it into "Pictures". that's why when I do a script for example that call Rsync I have to specify the path in English. So I'have always thought that for programming anything I should have used the EN names..

By the way that was the case some OS ago... I had copied a similar script to yours to do the same some years ago (I don't remember though what version of the OSX was) and it worked the same but it used "Folder".. I would never ever thought that could be the problem!

Thank you very much indeed and Happy Easter! that was really an Easter egg.. :-))

Best

on run {input, parameters}
tell application "Finder"
		repeat with anItem in input
			if kind of anItem is "Cartella" then
				set theFiles to (every file in entire contents of folder anItem)
				repeat with afile in theFiles
					set extension hidden of afile to true
				end repeat
			else
				set extension hidden of anItem to true
			end if
		end repeat

	end tell
	return

	

end run

the Kind is indeed "Cartella". Which complicates very much adapting scripts found on the internet which are all in English to localized versions of OSX ; one should know what are the elements of apple scripts or shell scripts which should be or not "translated" into local language. Meaning you have to make a course for programming in apple script; while the average user like me limits to find some scripts for doing basic things and tries to use it in its environment; so far I managed to do some basic things but if variables like language enters into play, then it becomes hard to devine what has to be "translated and what not.

Indeed, if I run your script whatever folder I select, FolderName is always "Cartella".

Are you suggesting to add this code lines on top of the previous script, or you just to keep it in order to check the name of a variable before writing any other script?

Thanks in any case.

Thank you very much indeed