It's always good to Google it first 
Use the 'TextUtils' extension, not the one for list.
Link: All Rescued Extensions From Inactive Communities - #47 by Anke
See here to see how to use it.
Note: A dot (.) is a thousand seperator in German. So, the 'replace all text' replaces that dot with a regular thousand separater, a comma (,).
Hope this helps.