Updating zh_CN.po from Zheng Qian

Merged Antenore Gatta (tmow) requested to merge l10n_po-zh-CN into master

This is based on the file sent to l10n@lists.remmina.org by Zheng Qian

Looks good to me, there are only some spaces that probably could be removed, but I'm not sure as my Chinese is not that good ;-)

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