added missing NL translations

[tiwu]

Description

Added missing translation keys for Dutch (nl).

Related Issue

none

Motivation and Context

Adds missing translations.

How Has This Been Tested

Tested in codespaces with the start:hass npm task.

Types of changes

• 🐛 Bug fix (non-breaking change which fixes an issue)
• 🚀 New feature (non-breaking change which adds functionality)
• 🌎 Translation (addition or update a translation)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have tested the change locally.
• I followed the steps if I add a new language .