Merge branch 'stable-2.14'

* stable-2.14:
  Fix computation of the target branch on CI
  Align button width to labels
  Bring navigation back to Gerrit
  Align action buttons with the rest of plugin info
  Display plugin description
  Define new annotation to get the plugin URL path
  Add intro page after first admin login into Gerrit
  Redirect using path-based URL

Change-Id: I8939e170e1de6b8282b4a1b2f9e2e36c2c761ac8