What you import into the OpenStack manager is not a key pair; it is only a public key. The second half of the pair, the private key, is never imported.

Therefore, openstackmanager-keypairimported (which currently reads as "Imported keypair.") should be corrected to read "Imported public key."

Similarly, openstackmanager-keypairimportedfingerprint should be changed from "Imported keypair $1 with fingerprint $2." to "Imported public key $1 with fingerprint $2."