Jonas Jenwald 00720d059a [api-minor] Include the /Lang-property in the documentInfo, and use it in the viewer (issue 14110)
*Please note:* This is a tentative patch, since I don't have the necessary a11y-software to actually test it.

To avoid having to add a new API-method just for a single string, I figured that adding the new property to the existing `documentInfo`-data (accessed via `PDFDocumentProxy.getMetadata` in the API) will hopefully be deemed acceptable.
2021-10-16 14:27:47 +02:00
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