Is there an official English version of LTF-UL? I have found the German version of the ultralight regulations under Germany airworthiness authority, but I have not found a link for English version of that. is there any?
For LTF-UL 2019 there is no official English translation, unlike, say, documents from the United Nations or the Vatican.  German aviation forums have plenty of statements like

Ja eine offizielle englische Übersetzung gibt es tatsächlich nicht

But the document's language is technical and precise enough that Google Translate can manage it accurately.  Here is the translation, as .txt (as HTML, something weird happened).  http://camille-g.com/tmp/LTF-UL-english.txt