The translation key for "Refund" is missing, when editing an order, in the Order Adjustments section.
As far as I know, this bug is only seen, when a tax which is applied to a given zone and set to be included in the price. If a customer has a billing address outside this zone then this will turn up as a refunded amount, in adjustments.

bug-s3: a feature is broken but there is a workaround
Hello, can I be assigned to this as my first issue?
Yes thank you @nelsonwenner, I have assigned you.
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@nelsonwenner feel free to check out our wiki about i18n: https://github.com/openfoodfoundation/openfoodnetwork/wiki/Internationalisation-(i18n)