Show template on Cluster Details page

 * The origin template is shown on Cluster Details page
 * Removed unneccessary brackets
 * Make old requests for templates safe
 * Renamed "Node Group Template" to "Template" on Cluster Template Details
   Page for Node Groups

Change-Id: I0ad367ffaf2df3bb61f8f0367b05ebb02616b6bc
Merge "Show template on Cluster Details page"