fix a typo.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28448 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_web_multiflex5_theme/bt/comment

-National flag icons (icon_flag_*.png) from http://flags.blogpotato.de/ are licensed under http://creativecommons.org/licenses/by-sa/3.0/deed.en_US .
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+National flag icons (icon_lang_*.png) from http://flags.blogpotato.de/ are licensed under http://creativecommons.org/licenses/by-sa/3.0/deed.en_US .
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