contrib: specify proceedings in imprint title label

[ptamarit]

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Description

• Fixes Clarify that the Imprint Title field is serialized to the booktitle BibTeX field #1919
• Before/after screenshot:
  

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[ptamarit]

The field (Place) has a description matching the "book or report" (Place where the book or report was published), so I'm wondering if it should be changed too for consistency.
However, this field is not used in the BibTex export.

[tmorrell]

We're for leaving it as-is. We want to encourage folks to use the conference place field for location, so adding conference-related help text here is likely to cause more confusion.

[tmorrell]

The Caltech library folks reviewed this change, and it looks good. We also think it might be good to remove Chapter. Caltech added it in the first place, so we're fixing our own mistake. With the new book section serializer #1921, the fields are specific not about the Chapter, they are about the Book. So "Imprint (Book, Report, or Conference proceedings)" is probably an even better label.

[tmorrell]

Probably switch to "Imprint (Book, Report, or Conference proceedings)"

[tmorrell]

We're for leaving it as-is. We want to encourage folks to use the conference place field for location, so adding conference-related help text here is likely to cause more confusion.