Fixes #14181 - Validate registry URL and attempt login
In order to avoid users trying to create containers in an externalregistry that doesn't exist, we should provide some preventativemeasures.
Fixes #13227 - error when creating a container without an image
Fixes #13231 - error processing uses full_messages
Fixes #11984 - Update the plugin to use the latest gettext from core,and re-extract the strings.
Once this is merged, the project needs to be added to transifex.
Multiple fixes to release 2.0.1
Refs #13225 - Use Patternfly spinners helper
Fixes #13228 - add attr_accessible to enviroment and image
Fixes #12971 - Container tab switch doesn't work when docker registry name contains special character
Fixes #13225: Don't declare spinner.gif with /assets prefixed
Fixes #13167 - Add buttons fixed
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