change root to home#index

because we need now the show for a page after signup
the landing_page will now home#index
introducing new home#show
introduce after sign-up
introducing after signup page

using locales for complete content
modify text according to the issue
remove developmentspecific raise
fixing tests
fixing locale for sign_up page
Merge branch 'staging' into 683-welcome_page_after_sign_up

Conflicts:
	config/locales/en.yml
Merge pull request #881 from ontohub/683-welcome_page_after_sign_up

683 welcome page after sign up