CafecitoSprint WAI-ARIA support

This branch adds WAI-ARIA support to TextWidget, this could be easily extended to other widget if the method used in this branch is considered right.
First we're adding an id to description <span> so it could be referenced.
Then the input template of TextWidget adds two properties, aria-describedby and aria-required, those properties are obtained via a helper view. More properties could be added as needed and the templates aren't burdened with too much logic.