271289

Add support of ß (a German letter)

1

**Behavior** My headline "Preußen" results in the link `[Preußen](#preuen)`. **Background information** The letter "ß" is used [very often](https://de.wiktionary.org/wiki/Verzeichnis:Deutsch/W%C3%B6rter_mit_%C3%9F) in German. **Solution** Change `hash = hash.replace /[^a-z0-9\u4e00-\u9fa5äüö\-]/g, ""` to `hash =...