I wonder if you can set a language other than English to send the application to the store windows.
Not sure how that is set, will require some investigation into the build system. Please check on our more active forum at https://forums.html5dev-software.intel.com for more info regarding this issue.
I had the same problem. I just copied my html files, then created metro app in visual studio. Then you can add the control "webview" and import the html 5 files to the project.wth this option you can configure all options such as tiles,(in all sizes) ,splash screens etc.