Bugfix/collatex tokenization

Bug fix

Summary

This MR fixes issues in the preparation of the tokenized text for CollateX (json version). At least one document (Sbath 25) was not prepared.

Compliance to “Definition of Done”

• Unit tests passed
• Code reviewed
• Product Owner accepts the User Story

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.

Closes

/cc Mathias Göbel, Frank Schneider, Michelle Weidling