Add support to __config__ for form name label

[signebedi]

That is, allow people to overwrite the form name visible in the UI.

[signebedi]

Propagate form_label name to the UI navbar
The navbar does not currently use the form_label field. It makes sense; to access it, we need to (under current logic) render the full form model / config. Instead, we might want to create a macro called get_visible_form_names() that return a key-value pair between the form config name (eg. not necessarily human readable) and the human readable form, which defaults to a title-case rendering of the form name but can be overwritten by the form_label field.