Role and aria attributes (#136)

* validation: stubbed aria-* attributes;

* validation: filling in aria-* attributes;

* validation: complete aria-* attributes;

* validation: fill in role attribute;

* validation: aria-* attributes: remove hack in isData;

* validation: filled in two attributes which were left out;

* minor fixes

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Co-authored-by: angel <angel@mycos.local>
Co-authored-by: angel <angel@MYCOS.station>
Co-authored-by: Loris Cro <kappaloris@gmail.com>

Author: 4 people