LPS-37639 Extract the logic of getting the action label to its a method

Call the method getActionLabel() because the word Label is more appropriate and consistent with other JSPs than the word Message
LPS-37639 Use the _getActionLabel() method from the summary
LPS-37639 Use the configuration icon instead of edit (requested by PM)
LPS-37664 Remove the cancel button since it wasn't working and is not really necessary any more
LPS-37639 Rename PortletKeys with legacy names (keeping old names deprecated)
LPS-37664 The view permission should be set in the JSP (the root problem was that the cmd was not namespaced)
LPS-37266 Move the  ADD_PORTLET_DISPLAY_TEMPLATE  actions to the portlet to which the template is applied.

This commit undos c5dfe01 for a better solution.