#410638 follow-up by foxtrotcharlie and David Rothstein: Fix help text on blocks so that 'Powered by' doesn't show up on all system blocks.
#410638 follow-up by foxtrotcharlie and David Rothstein: Fix help text on blocks so that 'Powered by' doesn't show up on all system blocks.

lincgr/Prueba,joshkoenig/golden-god-demo,edutrul/social-web,rmcveigh/frontend-dev,OccupyWallStreet/streetnet,brainhell/drupalglass,edutrul/social-web,rmcveigh/frontend-dev,joshkoenig/golden-god-demo,rmcveigh/frontend-dev,joshkoenig/golden-god-demo,edutrul/social-web,joshkoenig/golden-god-demo,lincgr/Prueba,edutrul/social-web,OccupyWallStreet/streetnet,lincgr/Prueba,joshkoenig/golden-god-demo,joshkoenig/golden-god-demo,lincgr/Prueba,joshkoenig/golden-god-demo,OccupyWallStreet/streetnet,brainhell/drupalglass,brainhell/drupalglass,brainhell/drupalglass,brainhell/drupalglass,OccupyWallStreet/streetnet,edutrul/social-web