Help - no language after installing module cookie confirm

Hello,

I'm in trouble after installing cookie confirm for EU law :https://www.twentronix.com/extensions/cookieconfirm

in my website http://NicolasGuy.com
I've this message
TPL_GK_LANG_ERROR_INFO
TPL_GK_LANG_ERROR_DESC

my file languages seems to be ok,
joomla 3.3.

what can I do?

Thanks for your help,

regards,

Please try to overwrite template language file in root/languages/en-GB. Did you modify anything in this file?