Subdir

Allows us to host the app on a subdirectory.

This will be /employment-tribunals. Or whatever's set as RAILS_RELATIVE_URL_ROOT.

Unfortunately we have a bunch of static links in our locale file. Is it rendered anywhere i.e. can we use the environment variable somehow?
Can we get opinions from @tomwm @helenmott 

Can we host the app on the root of employmenttribunals.service.gov.uk or does it have to be at employmenttribunals.service.gov.uk/employment-tribunals