Bugfix/#90 title object

Bug fix

Summary

The Item Object now delivers a Title Object instead of a simple string as value for title in accordance to the TextAPI.

Furthermore, a normalization of the title string has been introduced.

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

Closes

Closes #90 (closed).

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