In News content elements: "Add new record after this record" + button not working
Summary
When editing a news article, clicking the "Add new record after this record" plus button in the Content elements tab results in an "undefined error" message.
Steps to reproduce
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SU to my user
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Create a new news article
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Add a content element using the "Create new" button
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Save
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Click the "Add new record after this record" plus button on the content element you created