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Especially as a non-native English speaker, I often rely on the Material Design guidelines as my source for UI writing style.

I see you first sentence was taken directly from this, so I guess you already know about it :)

Thanks for your link it's exactly what I was looking for.

Microsoft's text style guide isn't formatted particularly well (it's been through a few MSDN stylesheet changes without a rewrite), but the advice it gives is pretty solid as well: https://msdn.microsoft.com/en-us/library/windows/desktop/dn7...