Is there an official English version of LTF-UL?
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