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On creating or editing an entity in BookBrainz (see a creation form), if a user clicks "Add relationship" to open the relationship editor and fills in both fields, they should be able to press the enter key to add the relationship (equivalent to clicking the "Add" button) for convenience. For comparison, pressing the escape key closes the modal (equivalent to clicking the "Close" button).

Follow the instructions on the BookBrainz site github repo to run a local development environment. When you are satisfied with your code, create a pull request ("PR"), comment on this task with a link to the PR that we will review.