Add Dutch locale

[DanielleHuisman]

What kind of change does this PR introduce?
Add Dutch locale (#2)

What is the current behavior?

What is the new behavior?

Checklist:

• Documentation
• Tests
• Ready to be merged

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[arthurdenner]

Thanks for your contribution, @DanielHuisman!

[arthurdenner]

@allcontributors please add @DanielHuisman for code.

[allcontributors]

@arthurdenner

I've put up a pull request to add @DanielHuisman! 🎉

[arthurdenner]

Your other pull request will be reviewed another day because I need a deeper review and it may relate to another open PR.
I haven't had the time to focus on the "PRs with bigger changes" for a while. :(

[github-actions]

🎉 This PR is included in version 2.17.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀