Fix translation error in zh_CN.po for "parameter specified more than once"

[ji xu]

Hi Hackers,

I found a translation error in the src/backend/po/zh_CN.po file.

The message "parameter "%s" specified more than once" is currently
translated as "表名 "%s" 被指定多次", which incorrectly says "table name" instead
of "parameter".

This patch corrects the translation to "参数 "%s" 被指定多次".

Regards,
ji xu

v1-0001-Note-that-translation-error.patch
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