Sanitize Danish letters correctly, and WP 5 compatible

Thank you for this “must have” plugin ??

Small thing. The Danish letters ??? are sanitized, but not quite correctly. The correct way is this
? and ? : ae
? and ? : oe
? and ? : aa

Using the built in plugin editor, I was able to fix the letters in the following strings

'a','a','a','a','aa','ae','c','e','e','e','e','i','i','i','i','d','n','o','o','o','x','oe','u','u','u','y','p', // extra all
			'a','a','a','a','aa','ae','c','e','e','e','e','i','i','i','i','d','n','o','o','o','x','oe','u','u','u','y','p','y','y',

Now ??? is sanitized correctly.

FYI:This edit, was done in WordPress 5.0 beta 4, and Clean Filenames seems to behave just fine under WP5

Kind regards
Bjarne