po: Update Simplified Chinese translation.

[Jactry Zeng]

Hi Boyuan,

Thanks for your contribution!
This patch looks fine to me, but I'm not sure should we add translation
which is fuzzy:
>  #: cryptui.rc:286
> +#, fuzzy
>
>  #: cryptui.rc:376
> +#, fuzzy


-- 
Regards,
Jactry Zeng
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