Fix incorrect msgstr's to avoid translation errors

There are numerous msgstr's in the cinder.po files for en_US,
en_AU and en_GB that are incorrect translations of the associated
msgid.  It appears that there are a number that are the result of
problems with past fuzzy translations gone wrong and some may also be the
result of copy/paste mistakes.  Regardless of the origin it makes debug and
development very difficult if the string that is coming out in the
logs doesn't match what is expected.  This patch fixes the numerous
bad msgstr's.

Once this commit is merged, Transifex will catch the change to
the Cinder po files and then spin a new Transifex Translations import.

Fixes bug #1209317

Change-Id: Ia78f5ebb4bec996798798bb25ea1b97c47b5e50b
Merge "Fix incorrect msgstr's to avoid translation errors"