Offer contacts 1.5.2 to oC 9.1.x

Contacts 1.5.2 is available at the new marketplace. It is missing at
IMHO it should be made available in the old store, too.
As far as I understand, this would make the update available in the oC-9.1.x GUI.
The app could be updated before upgrading the server to 10.0.x and resolve compatibility problems before running into them.