###

### Steps to reproduce

1. Login and open a projects/Calendars

2. On the calendars index page, click on the bin to delete a calendar


### What is the buggy behavior?

* Error 404 and the blank page


<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/799709/content">

### What is the expected behavior?

1. Index page should show as on prod (16.5)


### Note

This is also happening on team planners, Begin of the insertionboards, rolesEnd of the insertion Begin of the deletion boardsEnd of the deletion

### Environment information

**OpenProject version**

_16.6.0_

**Browser**

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

**Operating System**

* [ ] Windows
* [ ] Mac OS X
* [ ] Mobile iOS
* [ ] Mobile Android
* [x] Linux (please specify distro)
* [ ] Chrome OS
* [ ] Other (please specify)