auto cookiecutter slug umlaut replacement

cookiecutter-new-post/cookiecutter.json

@@ -1,6 +1,6 @@
 {
 	"repo_name": "content",
 	"title": "Title",
-	"slug": "slug-used-for-url-and-filename",
+	"slug": "{{ cookiecutter.title|lower|replace(' ', '-')|replace('ä', 'ae')|replace('ö', 'oe')|replace('ü', 'ue')|replace('ß', 'ss') }}",
 	"tags": "tags, goes, here"
 }