Content changes

link to GOV.UK, Acas link, employment details intro
Merge pull request #79 from ministryofjustice/editorial

Content changes
Fix to rails logstash-forwarder typo
Merge pull request #90 from ministryofjustice/logstash-typo

Fix to rails logstash-forwarder typo
Content changes

Name of employer, person or organisation, additional information,
remission hint text, other outcomes hint text, moved guidance link,
Merge pull request #93 from ministryofjustice/editorial

Content changes
Added additional envvars to ensure ping.json reports correctly.
Merge pull request #96 from ministryofjustice/update_docker_envvars

Added additional envvars to ensure ping.json reports correctly.
raise on missing translations, use relative keys, remove "copy" key, use translations in features