Improve help message in Retrieve Password form

A private key is used to decrypt a password.
It is better to update the message to mention "private key" explicitly
instead of "key pair". "key pair" is a pair of private and public key.

Change-Id: Icd5aa8fae2a348df011861469d028903bd71ec02
Closes-Bug: #1291529
Clarified success message for instance resize

Resize is an asynchronous action; the success
message can only confirm that the request for
resize was accepted by the nova API service
and that a corresponding RPC message was sent
to the nova scheduler service.

Closes-Bug: #1277257
Change-Id: I125c79c4c76fcb27f1e0d3c7122125e9036b1008
Merge "Improve help message in Retrieve Password form"
Merge "Clarified success message for instance resize"