2455: Fix/missing tanslations r=mergify[bot] a=DjVinnii
## What type of PR?
Fix/Enhancement
## What does this PR do?
Add missing Dutch translation, as well as the German translation for `Start of vacation`
### Related issue(s)
- closes#2217
## Prerequisites
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.
- [ ] In case of feature or enhancement: documentation updated accordingly
- [ ] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file.
Co-authored-by: Vincent Kling <v.kling@vinniict.nl>
Co-authored-by: Alexander Graf <ghostwheel42@users.noreply.github.com>
Co-authored-by: Dimitri Huisman <diman@huisman.xyz>