Fix incomplete translation of "Update members" widget

Marks the default value for the search fields of the "Update members"
widget translatable. Also updates the English PO file accordingly.

Change-Id: I8c317de49087b4207bcb774dd241fd1e4591882b
Closes-Bug: #1239927
(cherry picked from commit 3b79ec17b710000fa00523774ed2eff7dc1c12ca)
Role name should not be translated in Domain Groups dialog

Role names are retrieved from keystone and they should be displayed
as-is.

Change-Id: I62f9cb5582090e197fe2b7b434107dc801864571
Closes-Bug: #1255004
(cherry picked from commit 8ed32cc2785ffffbdcc0a2f0f745c10a226560fa)
Fix bug so that escaped html is not shown in volume detach dialog

Fixes bug #1252881

Change-Id: I8fc4ee78440c2682ad9185dcb88fa9d52ff969db
(cherry picked from commit 3e75fd4703ab757045b82249f230ebb0cefb3a0b)
Merge "Fix bug so that escaped html is not shown in volume detach dialog" into stable/havana
Merge "Role name should not be translated in Domain Groups dialog" into stable/havana
Merge "Fix incomplete translation of "Update members" widget" into stable/havana
Merge branch 'stable/havana' of https://github.com/openstack/horizon into stable/havana_routerrules