extract help links into a partial for the header
add I18n support, do anchors the rails way
Merge pull request #866 from loomio/feature/help-dropdown

Extract help links into a partial for the header nav
Merge branch 'master' of github.com:loomio/loomio

Conflicts:
	app/mailers/invite_people_mailer.rb
Merge branch 'feature/start-group-sign-up' of github.com:loomio/loomio into signup
add translations