### Steps to reproduce

1. Login as a user (with German language setting) with permissions to access the calendar module in project Begin of the insertionAEnd of the insertion Begin of the deletion A End of the deletion
2. Go to the calendar page and a new calendar
3. Click on a day in the month and add a task

### What is the buggy behavior?

* Begin of the deletion The date format inEnd of the deletion the Begin of the deletion task is YYYY-mm-dd
* theEnd of the deletion words "today", "month", "week" are not translated

### What is the expected behavior?

Begin of the deletion * The date format in the task is dd.mm.YYYY (as it is after saving the task)
End of the deletion * the words "today", "month", "week" are translated in German

### Environment information

**OpenProject installation type**

* [x] Hosted cloud edition
* [ ] Packaged installation
* What distribution?
* [ ] Docker All-in-one container
* [ ] Docker-compose installation
* [ ] Other (please specify)

**OpenProject version**

_If you're not running on the cloud edition, please specify the version of OpenProject you're running. Example: v12.1.5_

**Browser**

* [x] Chrome
* [x] Firefox
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)

**Language**

_German_