基本设置中增加匿名评论时昵称、电子邮件、网站的输入提示配置，可以修改评论时对应输入框的提示文字

[chengpei]

后台评论组件-基本设置中增加了匿名评论时昵称、电子邮件、网站这三个输入提示配置，可以修改评论时对应输入框的提示文字

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[ruibaby]

See #30 (comment)

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PR needs rebase.

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