I've tried debugging this, but the lsp.el refused to play ball. I know that Elixir language servers are a thing in motion, and probably it's about time to just hardcode the new one (which promises to ...
plug Cldr.Plug.SetLocale, apps: [:cldr, :gettext], cldr: MyApp.Cldr, gettext: MyAppWeb.Gettext, from: [:query, :path, :body, :cookie, :accept_language] where ...