fix: temporarily change return cardinality

Bug fix

Summary

The return cardinality of tei2html:find-referenced-node-id has been switched to ?.

The underlying problem is that the element referenced is on another page. But since the requirements for the linked elements in the visualization isn't clear, I don't know how to solve this problem.

Compliance to “Definition of Done”

• Unit tests passed
• Code reviewed
• Acceptance criteria met
• Functional tests passed
• Non-Functional requirements met
• Product Owner accepts the User Story

Related

Closes

Changelog

• I added a statement to the CHANGELOG.

Version number

• I bumped the version number in build.properties.

Readme and general docs

• I updated the README (if applicable) and kept the docs up to date.

/cc Mathias Göbel, Frank Schneider, Michelle Weidling