Bug 24057: Hea is not an acronym

Bug 24057: Hea is not an acronym

This patch changes "HEA" (incorrectly capitalized) to "Hea" on the
staff client administration home page.

To test, apply the patch and set the "UsageStats" system preference to
"No, let me think about it."

 - Go to Administration in the staff client.
 - There should be a message at the top asking if you want to share
   anonymous usage statisitcs with the community. The word "Hea" in this
   message should be capitalized correctly.

Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>