Cost formatting not using the specified locale

I added the following values to the values file:

global:
  cost:
    moneyLocale: "en_UK.UTF-8"
    perCpu: 1000000
    storageAtRest: 100000

The new costs are being used - since the costs for disk files are much higher than they would be otherwise, but the cost seems to still being formatted as a US cost: $0.33