Problem with translation of gk-contact-steakhouse.po

Hi,
I have installed WP plugin Codestyling Localization and now when I'm trying to translate gk-contact-steakhouse.po i'm getting en error and a warning.

Error: The actual loaded translation content does not match the textdomain: gk-contact-steakhouse
Expect, that any text you translate will not occure as long as the textdomain is mismatching!
This is a coding issue at the source files you try to translate, please contact the original Author and explain this mismatch.

Warning: The actual loaded translation content contains mixed textdomains and is not pure translateable within one textdomain.
It seems, that there is code contained extracted out of other plugins, themes or widgets and used by copy & paste inside some source files.

Please help

Hi,
Could you please provide me with a URL to your website and back-end access via PM (click the “Private Message” text underneath my avatar) so that I may analyze it?