Some time ago I accidentally created a custom label in German, while our main org language is English.
I want to update the language of the custom label to English, but this field is not editable if you click on edit in the UI:
I also tried updating this field through the metadata API, but this was not successful either.
I can always delete it and recreate it again in English, but I want to avoid this as the custom label is referenced in multiple places in our code base and I have to update a couple of labels.