Correct and add missing NL translations

[RayOei]

Minor typo corrected
Added missing entries for NL

[RayOei]

@wvengen As a first attempt to contribute, I have updated the NL.yml translation as I noticed those missing entries. Didn't create an issue for it, though. Should I?

[wvengen]

Thanks, PR looks fine. But there is an open discussion whether to accept translations here or in Crowdin. See also the wiki on Translation.

I think it would be helpful to do a Crowdin sync (pull translations), review, commit, and then merge this one, so that all the work there is not lost (though maybe just merging this is fine - I'm not fully sure though).

[RayOei]

Ah.. OK. Will check that. Better not to upset the workflow 😁

[RayOei]

@wvengen As a follow-up: needed to dig a bit 😁 (will make some notes on that for newbies) but have CrowdIn installed and working locally. I do not have permissions, though, to download the current state from CrowdIn so preparing a PR from that is also not possible.
I assume uploading is also not allowed but I added my translations directly in CrowdIn.

[wvengen]

Syncing Crowdin translations is something the maintainers need to do, so that is up to the development team.

[RayOei]

As, based on recent discussions, CrowdIn is currently not the decided way to handle translations, I have reopened this PR to correct some of the Dutch translations.