Support PdfContentImport with QUT title page

[koppor]

Example link: https://eprints.qut.edu.au/57853/1/master_pdflatex.pdf

First page:

Second page:

⚠ For contributing to JabRef this concrete PDF must not be checked in ⚠ -- One needs to find another PDF with a) this cover page and b) a open access license. - One could also make up such a PDF by Acrobat Professional if needed.

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Follow-up to #12135