better labels for 'participants'

[smaffulli]

It should be clearer that "Ticket participants" is Launchpad activity, "Discussion Participants" is ML activity, "Participants" is Ask activity.

[canasdiaz]

We have had the same discussion here and we do agree to follow this approach. It will be changed asap on the Openstack dashboard.

[dicortazar]

This is already fixed in the OpenStack dashboard, but not in product. I leave this issue open till this is fixed in product. In the meantime, the entry page of the OpenStack dashboard is updated: http://activity.openstack.org/dash/browser/