Improvements in TALES tests and Interfaces display

[glenfant]

- Provide same variables as in portal_actions in TALES tests
  [glenfant]

- Emphasize marker interfaces with an (ugly) "(*)" prefix.

Note that the new comments for TALES test in template will break one translation label.

@glenfant never mind, i fixed the issue here: https://github.com/plone/plone.app.debugtoolbar/commit/8859bdb19854c2a8e5cb9a02b86300105700e323