Carnival

This release contains 2 new features and several bug fixes.

• Revert commit 2885b7e which introduced several bugs and did not fix the timezone issue. For reference look at release v1.1.1-beta.2.
• Introduces dayjs for date parsing and formatting.
  • Standardizes all datetime writes to the db. This time using dayjs.
  • Uses dayjs w/o explicit utc conversion as the api implementation does that already. This behaviour caused the confusion in the first place but is actually great if you know about it.
• Handles null values in new entries in the db now gracefully when rendering.
• Adds a reset button for filters in the staff events view.
• Adds a confirmation modal for deletions.
• Fixes some typos in the german translations.
• Some housekeeping.