[Openstack-i18n] stable-liberty is created for nova project

Hi, translation team Nova has its RC1 cut yesterday. Hard string freeze is happened. I have created the corresponding version for liberty in Zanata. The version name is stable-liberty. So from now on, all translations/review should be made in the stable-liberty version. The master version is set "Read Only" and will be open to accept translations after Liberty is done. Any problems, please let me know. Best regards Ying Chun Guo (Daisy)