Clicking "Enter" on keyboard while on modal forms that don't contain multi-line potential fields (despite not being focused on) should submit the form

[manfromjupyter]

Example: Going to External Resources, creating new external resource, clicking on title field, entering title, clicking on url field, entering url, and then pressing "Enter" on your keyboard should as a shortcut submit the form. At the very least it shouldn't close the modal by pressing that because most sane people might assume it's closing because it succeeded.

Applies to other forms I bet as well, but External Resources is a perfect example because no form contains or can contain a carriage return (no description, no reasoning, or comment field).

[manfromjupyter]

Blocked until #639 and #848, else the pressing of the Enter key shouldn't attempt to submit form.