Tweak the way the max list limit is constrained.

Exceeding it will use the max rather than the default.
Add a helpdesk link to the account bar
Rationalise messages and terminology used in portal. Fixes #447
Merge branch 'master' into new_front_page

Conflicts:
	modules/portal/app/views/p/layout/header.scala.html
	modules/portal/app/views/p/layout/headerAccountAdmin.scala.html
	modules/portal/app/views/p/portal.scala.html
	modules/portal/conf/messages