Updated openstack/openstack
Project: openstack/horizon  66eb7b427fad12dd9d40224d9730e1550fe6b040

Remove string concatenation related to volume attachment

Translatable string "on" is a part of string concatenation
and it makes difficult to translate it properly.

Change-Id: Ib2bf65791899a3c69087749d3a5fcf5061568b5d
Closes-Bug: #1382874