Unable to add hyperlink in copyright field
cc @jordandc
Expected behaviour
User should be able to successfully use hyperlink style button to add external links to fields where this is supported.
Current behaviour
User is unable to use the hyperlink style button to add external link to copyright field
Steps to reproduce
Go to any chapter-processed book, and go to metadata tab, enter copyright text and try to add a link to some text.
Priority
Y, for migration