For fun I just switched the site language to Dutch. It's pretty bad Dutch, inconsistent, and some phrases are plain nonsensical and need to be translated back to English in order to understand them. Do we really need it? Is anyone using it? I think the site would look more professional if it'd just be chucked, but that's my opinion
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Edit: I just tried Spanish and yeah, I could help improving these translations too @Lawrence
I don't know if Google is involved, but I think there's something going on with Dutch and Google - many languages translate very well on Google translate, but many Dutch sentences often turn into complete gibberish. Maybe this is because virtually all Dutch speakers speak English, so it has no priority.
..which is also why I'd advice removing Dutch. Other languages may be useful, but even my late grandma spoke better English than what is rendered here. So it doesn't really add anything in terms of intelligibility. From what I've noticed, Dutch people generally seem prefer installing software in English rather than Dutch even when the translation isn't bad.