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?
Why can't nginx handle the paths needed and us not mount this app on a path? `/employment-tribunals/apply/claimant` for example is a horrible path.