cubicweb #473938 Improve default file input widget [open]

The default behaviour of input field for file browsing is very restricted and unpleasant to beginners. For example, we can't set a default button label or change the text input value.

An ergonomic improvement could be to make a new default widget for the CubicWeb framework and revamp the file cube forms.

See:

priorityminor
typeenhancement
done in<not specified>
closed by<not specified>