When using the html5php parser the german character ß is encoded to &zlig; but it should be ß
When using libxml parser it works correctly.
Example Feed with lots of &zlig; (https://ftrss.sherbers.de/makefulltextfeed.php?url=www.heise.de%2Fnewsticker%2Fheise-atom.xml&max=10&links=preserve&exc=&submit=Create+Feed&parser=html5php)
Same feed with libxml parser and correctly encoded ß (https://ftrss.sherbers.de/makefulltextfeed.php?url=www.heise.de%2Fnewsticker%2Fheise-atom.xml&max=10&links=preserve&exc=&submit=Create+Feed&parser=libxml)
I used grep to search for zlig in every file of Full Text RSS but everything seems to use the correct ß