Enable a metadata group in the XML import for the calendar

[subhhwendt]

Is your feature request related to a problem? Please describe. Just as in the interface for creating tasks via calendar, it is not possible to transfer metadata that is expected in the ruleset as a metadata group when importing via XML. In our ruleset the language of a document is connected in a metadata group to a specific writing system for fine tuning of OCR.

Describe the solution you'd like We need an extension of the xml import option for metadata groups (syntax/processing).