ECMS-6082: SEO Management (robots.txt and sitemaps.xml) doesn't work

Fix description:
	- Save robot content in String format
ECMS-6089: [IE8] [Content Explorer] Exception thrown when clicking on the link of Relations

Fix description:
	- Use onclick for action instead of href
ECMS-5948: ArrayIndexOutOfBoundsException when saving an ECMS script

Fix description:
  - verify the array size before access the first element
Merge commit '25b75ed51f3e8b25b796a570a4072f58392a7702' into HEAD