Correct locale loading

[johlym]

After upgrading to Ruby 3.3, this path stopped getting populated correctly, and as such, we no longer had any defined localizations. It wasn't reproducible locally, so was missed in recent updates.

Also dropped bundle exec from the Procfile – running the app in that context is causing an error somewhere in the chain that is being swallowed; bundle is exiting 0 and not being helpful. There really isn't a great reason to bundle exec a Sinatra app that I can think of... generally one uses ruby directly or through Rack with rackup.