First the link to your demo is broken so you need to look at that. Good to see you have a link back to the osC website.
Unfortunately the software you have although it is the official version it’s out of date and is not mobile ready. Try using your demo store on a mobile phone!
You would be better off producing a laguage add-on for the upto date comunity version of the software.
This for BS3
Or this for BS4