obtain radio button labels from localisation file
Updated contributing guideline
Merge pull request #485 from ministryofjustice/update-contributing-guide

Updated contributing guideline
comment to explain translation_key() method
Updated the Journey Data usage in the README
Merge pull request #487 from ministryofjustice/readme-test-update

Updated the Journey Data usage in the README
removed radio label text from haml templates into en.yml localization file; raise exception if radio button translation is missing
Merge pull request #488 from ministryofjustice/i18n

Moved radio button labels into en.yml localisation file
removed repetition in localisation file key names by adding an extra level
changed double to single quotes
Merge pull request #489 from ministryofjustice/i18n-2

Removed repetition in localisation file key names
Merge branch 'master' into postcode_hint

* master:
  changed double to single quotes
  removed repetition in localisation file key names by adding an extra level
  removed radio label text from haml templates into en.yml localization file; raise exception if radio button translation is missing
  Updated the Journey Data usage in the README
  comment to explain translation_key() method
  Updated contributing guideline
  obtain radio button labels from localisation file

Conflicts:
	app/helpers/labelling_form_builder.rb