Create nl_NL.ini

[robiso]

Hello @flatsiedatsie thank you for the pull request and making some Netherlanders happier!

As a token of appreciation, we'd like to list you to our official contributors page, listed here: https://wondercms.com/contributors

Please send your first/last name and website, so we can link to it 🍺

[flatsiedatsie]

No need, but thanks!