UI tweaks to expose functionality [1/1]

This is a handful of small UI items
* fix missing localizations
* improve message for intentional overlay missing on roles
* button to retry a failed noderole (puts it back to TODO state)
* button to create an admin node if there are not nodes



 .../app/controllers/node_roles_controller.rb       |   11 ++++++
 .../app/controllers/nodes_controller.rb            |    5 +++
 crowbar_framework/app/models/node.rb               |    1 +
 .../app/views/node_roles/show.html.haml            |   10 ++++--
 crowbar_framework/app/views/nodes/_show.html.haml  |    2 +-
 crowbar_framework/app/views/nodes/index.html.haml  |   35 +++++++++++---------
 crowbar_framework/app/views/nodes/show.html.haml   |    3 +-
 crowbar_framework/config/locales/crowbar/en.yml    |    5 +++
 crowbar_framework/config/routes.rb                 |   10 ++++--
 9 files changed, 59 insertions(+), 23 deletions(-)

Crowbar-Pull-ID: 17e9e52fd7146eaff3ce9d6bdb0771008f8e2e9f

Crowbar-Release: development