Form fixes

[noirbizarre]

This PR fixes some major bugs in forms:

• forms errors were mispositionned and not injected into vue.js forms
• server side error were silently ignored
• success notification was always dispatched even on on transport or server-side error
• some forms were using 2 differents models (Dataset and Resource) for the same thing
• some forms were never able to dispatch a success notification
• hide-notification was never true
• there was no deletion success notification

The fixes are:

• rely on the updated event to consider a form successfuly submitted and only then route to the next view or close modal and show the success notification
• ensure jQuery.validate properly inject errors into vue.js forms
• ensure server-side errors are properly injected into vue.js forms
• ensure only one object/model is managed by each form
• use the same notification logic for deletion
• dispatch a notification for non-field errors
• fix the error labels style

This PR is a quick and temporary fix but this need a major refactoring (Vuex, promise, async... whatever)

[abulte]

This looks way cleaner and more robust 💪

[noirbizarre]

Yep, I tried to be stricter on separation of concerns between forms, views and models.
But, OMG, I'd like to have Vuex and async !!!!