Need some help - sed/grep/regex ?

Hello all gurus..

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So - Xenforo have this big language. This file is to be translated for us folks who is not native english.

Now - I have one issues with a add-on not post the translated phrases. I think there is a not closed phrases somewhere in my language file. The phrase line looks like this:

PHP:

<phrase title="margin" addon_id="XenForo" version_id="1000016" version_string="1.0.0 Alpha 6"><![CDATA[Margin]]></phrase>

What I wish is - are there someone who can offer me the correct way to search the whole text file for a missing [ or ] in til [CDATA part of the phrase sting?

Thanks in advance for your participate..