As a content editor, I want the location field for digital edition/translations to automatically populate from an existing edition/translation on the same source, so that I can save time manually re-entering it.

[blms]

testing notes (qa)

In the QA admin site, navigate to a document.

• Add an Edition footnote with some value in the "location" field
• Add a new transcription with the transcription editor on the same source as the Edition footnote you created
• In the transcription editor, create some annotation blocks on the images
• On the document, there should now be a new Digital Edition footnote with the same location as the Edition footnote
• Try the same with a Translation footnote with a location, adding a translation on the same source in the translation editor. The newly created Digital Translation footnote should get the same location as the Translation footnote
• Try this on a document with more than one Edition footnote on the same source, each having different locations. Using the transcription editor to create a new transcription on that source should not populate the new Digital Edition footnote with a location, since it is ambiguous which Edition footnote should be used.

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Requested by @mrustow over Slack. This should include:

• A one-time migration to copy all Footnote.location values from edition to digital edition, and translation to digital translation, on the same Source
• Logic to populate this automatically when users are creating digital content via annotations in the transcription/translation editor

[kseniaryzhova]

@blms works as it should, thank you! Closing!