Thanks for your post about Vollgeld!
Here's a direct link to a summary brochure in English from the Vollgeld official Website (alternatively go to the English part of the website, where it is the first item). As well as giving a summary and the actual text of the initiative with explanations, it covers the system of direct democracy in Switzerland.
https://www.vollgeld-initiative.ch/fa/img/English/2017_05_02_Referendum…