[Html-widget] formfu - problem with submit button value

[Mario Minati]

Hi Carl,

I am changing the value of a submit button with javascript to show the user 
that some data processing is going on.

This changed value is transmitted during the post request.

Now my problem.
FormFu is useing this (changed) value and build's a form with a submit button 
that holds this text instead of the usual value 'Submit' or whatever I 
defined in the YAML config.

Who can I change this behaviour? (retain_default:1 doesn't help)

Greets,
Mario