WIP: feat: change the fontsize consistently by percentage

Feature

Summary

This MR provides the consistent de- and increase of the fontsize in the text panel.

Does the result of the MR comply to our "definition of done"?

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

Documentation

• I updated the README (if applicable)
• I provided my functions with appropriate documentation
• I adjusted other parts of the documentation (if applicable)

Tests

Are we able to test this new feature?

• Yes, everything can be done via unit tests.
• Yes, you can test by following these steps:

• checkout the branch: git checkout feature/#178-change-fontsize-consistently
• open the index.template.html file:
  • set an entrypoint: https://ahikar-dev.sub.uni-goettingen.de/api/textapi/ahikar/syriac/collection.json
• start your dev environemnt: npm run dev
• navigate to: St. Petersburg Sado no. 9 => Sheet 1
• click the buttons at the top of the text panel to watch the fontsize in/decrease by 10% per click (default: 100%, min: 90%, max: 150%)

• No, it is not possible.

Changelog

• I added a statement to the CHANGELOG.

Related Tickets

Add all related issues and especially those to be closed.

Related

Closes

closes

#178 (closed)

Logs and Screenshots

/cc Mathias Göbel, Frank Schneider, Michelle Weidling