We always try to consistently use British English rather than American.
In the example, we find that the standard British English term is "driving licence", so that is what we should use for the English field.
Hopefully one day, students will be able to choose American English as the source language, rather like one day we hope students will be able to choose any language as the source language (like French or German). To make this possible, it's important that all the content is kept consistently using British English.