Number input does not work for all locales

[simonihmig]

The input control with type=number calls parseFloat() to return a proper number as the form value. But this does not take different locals into account, e.g. those that use a comma as the decimal separator.

We could make use of e.g. https://github.com/ApelegHQ/intl-number-parser or some equivalent npm package or bring our own implementation.