Escape special chars in product name and model

As this is passed more or less directly to the HTML-Form in the view, having special chars in the product name could prevent correct data from being send
Unify button style in some admin payment pages.
Merge pull request #1350 from hellaslubo/patch-admin-btn-ui

Unify button style in some admin payment pages.
Merge pull request #1348 from bthorben/patch-1

Escape special chars in product name and model