Enhancement request: Validation error messages

[bnjmnhssnn]

Currently, form validation error messages look like this:

Validation error:
Invalid input in "Some Field"

... where "Some Field" is the label for the field defined in the blueprint.
This is fine & sufficient when your admin form is short. But in complex admin forms, with tabs, lists, fieldsets, maybe nested or collapsed elements, it is hard to locate the invalid field.

I suggest to display a tree path consisting of element titles, labels or list indices, e.g.
Invalid input in "My Tabs > Friends > [12] > Favorite Gelato Flavor"

[mdestafadilah]

this is relate to #2299