Arefly

Disallow Japanese Language Comments in Your Blog. (Full Support with AJAX Comments Too!)
在你的部落格中禁止日文評論（? ?面支持AJAX評論提示）
Live Demo: <a href="http://www.arefly.com/no-japanese-comments/#respond" rel="nofollow ugc">Click Here</a> (Try Enter Some Japanese there)
<h4>Translators</h4>
<ul>
<li>Chinese, Simplified (zh_CN) – <a href="http://www.arefly.com/" rel="nofollow ugc">Arefly</a></li>
<li>Chinese, Traditional (zh_TW) – <a href="http://www.arefly.com" rel="nofollow ugc">Arefly</a></li>
<li>English (en_US) – <a href="http://www.arefly.com" rel="nofollow ugc">Arefly</a></li>
</ul>
If you have created your own language pack, or have an update of an existing one, you can send <a href="https://codex.wordpress.org/Translating_WordPress" rel="nofollow ugc">gettext PO and MO files</a> to <a href="http://www.arefly.com/about/" rel="nofollow ugc">Arefly</a> so that I can bundle it into No Japanese Comments. You can download the latest <a href="https://plugins.svn.wordpress.org/no-japanese-comments/trunk/lang/no-japanese-comments.pot" rel="nofollow ugc">POT file</a>.

No Japanese Comments

Disallow Japanese Language Comments in Your Blog. 在你的部落格中禁止日文評論

MoeHassan

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WP Email Guard protects your email addresses included on any post or page from being crawled by spammers.

No Japanese Comments vs WP Email Guard