Improve the aural interface for the toggle button for groups

[rpkoller]

The problem
The aural interface for the toggle element for groups on the consent dialog modal is sort of misleading:

groups.mov

First there is no popup in the context of the consent dialog modal, but a toggle that expands or collapses elements in place, the popup create false expectations. And second the announcement is not clear what the actual state is. arrow up and arrow down is not clear at all and in addition to that it is challenging for the user to figure out what the current state is if the label is changing inbetween states. am i in the "arrow up"-state or am i getting to the "arrow down"-state?

Proposed solution
One option might be going with a button that uses the aria-expanded attribute. as an alternative it might be considered using a details element.

PS: same as for the dialog modal issue that i'Ve create i am going to try to come up with an initial draft for a PR.

Alternative solutions

Additional context