After upgrading to the newest version of your plugin, the polish translation stopped working (http://shinea.pl). When I checked the translation in Codestyling Localization I'm getting such an error message:
Error: The actual loaded translation content does not match the textdomain: wpmenucart
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.
The affected unknown textdomains are:
I don't know if there is anything I can do to make it work soon...